I've just come across this problem (May 2018) and the solution does seem to work. Would it be possible to get a sentence added to the Android Chrome section on the download page?
Something along the lines of "5. To use the bookmarklet on a page, tap into the address bar for the page you want to grab and start typing the name you have saved the bookmarklet as. When it appears in the autocorrect, tap it."
I presume also that you need to be logged into your Zotero account in your mobile browser for it to know where to save to. Might be worth explicitly saying that in the documentation too.
Upgrade Storage
https://www.zotero.org/downloadbookmarklet
Something along the lines of "5. To use the bookmarklet on a page, tap into the address bar for the page you want to grab and start typing the name you have saved the bookmarklet as. When it appears in the autocorrect, tap it."
I presume also that you need to be logged into your Zotero account in your mobile browser for it to know where to save to. Might be worth explicitly saying that in the documentation too.
@jim if you're not logged in, Zotero will prompt you to login, so that doesn't required additional instructions.