Zotero 6 is still available from the download page, but staying on Zotero 6 isn't a good option — parts will stop working eventually and you won't receive any support here for problems. So you should provide actual examples of files that aren't working well for you in Zotero 7 so that we can investigate. Zotero 7 was in beta for over a year, and we have no reason to believe there are major problems with the PDF reader.

Thanks a lot for your answers - very much appreciated. I will try the suggested plugins when I upgrade again to Zotero 7. However, Zotero 7 is basically unusable for me right now, since the PDF-viewer is disfunctional for the most part: Slow and sluggish, not rendering pages etc. No problems with PDF in any other app (Firefox, Adobe, PDF24...).

I will reinstall it and even try it on different machines, when I have time to do so. Could you provide some information what you need and how?
Documents I tried:
- https://www.circhive.eu/resources
- https://doi.org/10.14512/9783987263361 "Faktencheck Artenvielfalt"

- the former documents: zooming in using ctrl and mousewheel led to pages not rendering. However, if I zoomed out again and moved to previous pages, these were rendered. When I then moved down again, the previously not rendered pages were rendered again.
- the latter document didnt open at all - this has over 1.000 pages though...

system: Intel I7-3770, 3.4 GHZ, just noticed however, that it is still Windows 10.

1) its about 120 MB, thus I cant send it. However, the download is free: https://www.oekom.de/buch/faktencheck-artenvielfalt-9783987260957 -> on the right hand side: "erhältlich als" - check "PDF 0,00€" - then you can download the document "freier download".
2) Memory: 16GB
3) 3840 x 2160

1) yes, 64 bit.
2) I tried to open it as the only tab.
I can open it without any problems when using Zotero 6.

since none of my plugins were working/enabled due to not being compatible with zotero 7, I can reproduce :-)

Sorry - holiday. I just checked: In Firefox, the documents (including zooming in-out) are displayed without any problems.

I'm curious if other users on this forum can reproduce the issue on Windows when zooming in on these PDF files:

https://www.circhive.eu/resources
https://www.oekom.de/buch/faktencheck-artenvielfalt-9783987260957

@dstillman your said " Zotero 6 isn't a good option", but there are still valid reasons for going back to Zotero 6. I understand that technically you sometimes have to get rid of technical debt, but in this case the lack of backward compatibility has broken what made one of the most robust Open Source projects...

I've lost so many useful features since Zotero 7
https://s3.amazonaws.com/zotero.org/images/forums/u1934613/atvjs20kn7k4mti4txc7.png

Zotfile's linked file features are covered by Zotmoov or Attanger. Zotmoov has also added some basic Send-To-Tablet-like operations. And there is apparently now a plugin just for that.
https://github.com/zouyonghao/zotero-sync-to-tablet

BTW plugins from v6 showing as disabled in v7 does not mean that a v7-compatible version is not available for download. For example DOI Manager is v7 compatible:
https://github.com/bwiernik/zotero-shortdoi/releases

The scite plugin also appears to be available for Z7 (assuming it is the same one - I could be wrong about that): https://github.com/scitedotai/scite-zotero-plugin

Going back to Z6 is not a solution, it's a work-around :-) The longer-term solution is to find suitable replacements, sometimes with different plugins, sometimes with the new functionalities of the main software.

@tim820 "BTW plugins from v6 showing as disabled in v7 does not mean that a v7-compatible version is not available for download." Good to know, ty ! Because Zotero has disable all my plugins and it tells me that there are no updates for these plugins when I click on the update button.

About suggesting plugins, it would be nice if they were put on this page for those who don't go to the forum: https://www.zotero.org/support/plugins. I guess it's up to the plugin authors to do this.

Yes, sometimes "no updates available" must be read as "no AUTOMATIC updates available". That's because writing the proper transition code to ensure support for both Z6 and Z7, including the plugin upgrade mechanism, can take more work than a plugin developer is willing to provide.

Edited to add, just to prevent any misunderstanding: this is entirely the developer's appreciation, I'm not blaming the Zenodo team in any way. Documentation is available, and the beta phase was long enough for most plugins to be ported if the authors were motivated.

Hi All,
Sorry to be another one encountering problems with the disappearance of zot file send to tablet functionality. yes, i'm aware of zotmoov etc and tried them but they are not full replacements. My scenario. I read and annotate PDF files on an e-ink tablet and use the send to tablet functionality to cycle PDF's between my computer and the e-ink device. The zotero mobile apps are not an option in this scenario. Although zotmoov can send a file to a directory it lacks the functionality of tracking which files are send to tablet (the tablet files folder in zotero) and the PDF's modified on the tablet ( the tablet files (modified folder)). These are highly relevant for the workflow i've been using for years. Also the way zotfile options were listed in the right click menu was more intuitive.
I have a lot of respect for all the work that the zotero developers do and in no way i'm complaining about the work that has been done. It's just in my particular workflow rather annoying to all off a sudden be encounter with functionality thats not working anymore. So I'm hoping zotfile as it was known will have a comeback but will have to explore returning to version 6 for now

@tim820
Thanks, im keeping an eye on zotmoov and have indeed supported suggestions. When all the functionality needed for my workflow or slight adjustments to the workflow will work i will definitely switch to the newer zotero. As said above, do appreciate all the work thats being done to keep zotero up-to-date.