Yes! Are you using an Onyx Boox device as well?
For me, using Zoo for Zotero with ZotFile's "Send to Tablet" option has resolved it. I think ZotEZ is more problematic. I will copy paste my post from another platform:

ZotFile plug-in enables sending and getting PDFs with their annotations from different platforms like different computers, tablet, phone etc.

After installing ZotFile to Zotero, I created a folder in my Drive for ZotFile (it should also be synced by Autosync) and I made it my "source folder for attaching new files" in ZotFile preferences.

I connected that folder to Zoo for Zotero as well.

At my computer, I sent my articles to the tablet through "send to tablet" option (under right-click --> manage attachments). Now I can open Zoo for Zotero on my tablet, open a PDF with the PDF reader, make highlights, take notes.

When I close the PDF on the tablet, Zoo asks permission to upload it. Then I go to Zotero at computer, I click the sync with Zotero button and they sync instantly.

It looks like so much to do when it's written but after you connect ZotFile and Google Drive with Autosync, there is nothing much left.

You can look for the details of ZotFile from this page: https://www.zotero.org/support/sync#alternative_syncing_solutions

Did you check NeoReader's export settings in Settings -> Export settings (including "Export to Storage\note" and "Export to the same directory as the source file"). For mine, the first, storage one, is checked and the second isn't. Maybe that's why mine doesn't produce any duplicates for annotation. Xodo is nice but scribbling and writing is delayed like many other apps, so it's far from ideal I think.

Also, I didn't need to use "get from tablet", I just click the refresh button at Zotero and it works. But I understand that it might be too much of a workload sometimes.
I hope you can find the perfect way for you!

@aise. Oh, ok! The same thing is ticked for me in NeoReader's export settings. Can I ask where your attachment location is in Zoo? I only seem to be able to choose folders in the downloads folder for this. I am really confused why this solution works for you but doesn't for me -- I tried all the same steps and it only worked if I also used the "get from tablet" option, without ever using Zoo & without the advantages of having a Zotero library on my boox :(

@cruwell Also, are you sure that Autosync for Drive (or Dropbox) works smoothly? You should buy the paid version to sync files larger than 10 MB, if I remember correctly. This might be the problem as well.

Another thing, it isn't related but I recommend that you turn off "Whiten Apps Background" option at all apps' optimization settings because it makes many options and settings "invisible".

@sojal2 I think your problem derives from the error, you checked the correct place for permission, right? It's under Settings (Onyx's general settings) -> Applications -> Application info -> Zoo for Zotero -> Permissions -> click on Storage and give permission.

You can do the same thing for ZotEZ, maybe that one will work who knows. Also, Google Play should be enabled.

But I checked my permission settings and I realized the storage was denied for Zoo, I don't know why :/ If allowing doesn't work, maybe you can try to deny it.

It's very basic and I'm sure you already thought but you can update them if there is any available updates (for Onyx, Zoo, and ZotEZ). Deleting caches and the app might be a solution too.

In terms of a seamless experience across Mac and tablet, I would really strongly recommend an iPad instead. Zotero has an official iPad app currently in beta testing that works well.

The setup you describe will work currently, but there are several big limitations:
1. It won’t work with Group libraries
2. The current Zotero beta has a new note editor and PDF viewer. Annotations made with an external editor cannot currently fully interface with the new note editor (eg, extracting annotations to notes). @dstillman could say more there. Even if Zotero does get the ability to convert external annotations, this would still be much less smooth than using Zotero’s native annotation tools in its own app.

Thank you for your responses. I see the issue with the new Zotero editor/viewer. And I guess @aise. 's method is not that complicated after all.

Could any of you tell me if Zoo for Zotero is indeed compatible with the Zotero editor/viewer on Mac?

Thanks, @aise for creating this thread. I have experimented with both setups:

1. Zotero client at the laptop -> Zotfile -> Dropbox -> Boox Note Air
2. Zotero client at the laptop -> Zotero server -> Zoo at the Book Note Air

Both can be used by themselves and at the same time if needed... So far, given my workflow (laptop centered) I am liking 1 better, but there are situations when having 2 available is useful. I also have a complex setup, with a Laptop that is mainly used in Linux but can also boot Windows, a desktop, a phone, and the Note Air, so this may be an overkill, but in the end, I would like to work from anywhere. In the end one will like to:

1. Move documents from your working computer to the Note Air for reading and highlighting and some note-taking.
2. It should be as automatic as possible (it is not totally true, in both cases one has to be careful and check the different syncs. the different servers do not always sync immediately.
3. I do not like to have many copies around to avoid conflicts... In my mind, I am working on the document in a given place and when I finish it should be clear we are done. But, sometimes I may forget where is it that I am working it: a quick look and modification in the laptop, while I have the document also in the tablet, can create a conflict that AFAIK needs to be solved by hand.

In any case, even if using Zoo I set up Dropbox because it will be my main method of transferring files from the Boox from the computers.

So I follow this tutorial (check all the videos in the series, they are great).

https://www.youtube.com/watch?v=rtJ3TRdTffI&list=PLsSI9-gaSSmjVEQ4LhrBD9Ej0dlP2_rLy&index=4

But I create a directory Dropbox/Boox on my computer. Inside that directory I have several subdirectories since I will use to transfer files back and forth:

Zotero (for the documents that will participate in the workflow)
PDFs (Other PDFs)
EBooks (Even if in the Zotero cloud, neither Zoo nor Zotfile seems to manage EPUB and MOBI formats for transferring them so I need to do this manually)
Videos (I can record in the Note Air capturing the screen and my voice)
Class (etc)

Then I use Autosync to mirror this to my Book folder in the Note. I use the paid version, it is worth it.

Anything I put in Dropbox/Boox/Zotero will then show up at my Note Air in Book/Zotero. BTW I use the "Folder view" and not the Bookshelves view in the Note Air: See (Bookshelves vs folders) in

https://www.youtube.com/watch?v=mJdwx0rYRB0&list=PLsSI9-gaSSmjVEQ4LhrBD9Ej0dlP2_rLy&index=7

Any changes created by Neoreader will be eventually copied back to the Dropbox cloud.
(Things are not as simple since Autosync will not constantly sync to avoid spending the battery etc and in the Laptop Dropbox does not sense immediately when things have changed in the cloud, at least the Linux client. So often times you must manually force the syncs if you know you need to work in the other computer).

So in my Zotero Client on the laptop, I configure Zotfile to use the "tablet" as Dropbox/Boox/Zotero. I tell it not to use subdirectories and I can "Send to the tablet" and "Get from the tablet". However, there is no way to avoid conflicts, but at least I can see what was sent to de Note Air (the option "Get from the table" is not visible if it was not sent there earlier. If you happen to modify in both places Dropbox notes the conflict and will another copy.... but you do not want to do that...

When you do the "Get from the tablet" the file will be erased from the Dropbox AND the tablet. Technically liberating the space in the Note. So when I open the tablet the file is no longer there... (However, you can get the file and immediately put it back but that will imply a roundtrip to the Note). I prefer to only have a few documents I am reading and annotating.

Now, it is a good idea to also have Zoo... It lets me see all my library and solves the problem that I am reading and annotating stuff on the tablet and then I realize I need to consult another document but I do not want to go to the laptop to download it, so I can directly from Zoo get it in the tablet. I changed the Zoo download directory to ALSO Book/Zotero (maybe not a good idea) but since Zoo will always use a subdirectory (some key in Zotero) it is clear that the files from Zoo will be in subdirectories and the ones on the top the Zotfile transfers. An added bonus/problem is that the file will also sync back to Dropbox, probably a waste of bandwidh but now from the laptop, I can see that I am also working on a document using Zoo on the tablet (just by inspecting the Dropbox/Boox/Zotero directory). Maybe the Zotero servers take care of this things but I do not believe it controls how many copies of the file are in the wild for editing.

When I finish working with the document downloaded with Zoo I can push it to the Zotero web but the copy will stay locally. If I subsequently work on that document in the laptop I will have a conflict. As far as I know, Zoo detects the conflict and you can force it to upload your local file but it has always failed with an error. If you want to eliminate the file from the tablet you must tell Zoo to do that.

So, you can use both independently but I will stick to one method for most of my work.

Regarding Neoreader. It works very well and allows to see larger documents well. But you must keep in mind:

1. Underlining is not the same as Highlighting. Zotero will only extract highlighting.
2. You must be sure that Neoreader has actually saved the file before you try to return it to Zotero (in either method). Simply exiting by switching to another app does not guarantee it. You must navigate back using the left arrow in the top menu to the left and you will see the message that it is saving the file. (This is only important if you want to upload back to Zoo or Dropbox the file).

So it is complicated but you have options.

I like very much the integrated editor in the new version of Zotero. But then you lose the ability to work from different platforms since it saves the notes in another file. Hopefully, they will find a way to, by configuration, be able to merge into the file the annotations in a transparent way (you can do it now but then it is "outside" of the workflow since it saves another copy).