As mentioned above: DEVONthink must be installed in the /Applications folder. Is this the case?
Also, does DEVONthink have Full Disk Access enabled in System Preferences > Security & Privacy > Privacy ?
yes and yes, I went through all and any advice that I found here and in other threads, nothing seems to make a difference.
BTW, neither does MDM – my 14" MacBook Pro and my Intel mini are both managed under MDM, and everything works – however, they were installed more than a year ago and updated since then, while my M2 Air and Mac Studio are both installed freshly (Ventura and upgraded to Sonoma since) and both do not have the sharing extension.
Is DEVONthink’s extension enabled or at least shown in System Settings > Extensions > Sharing?
ok, this is the solution:
on Sonoma (and Ventura, I suppose) the new System Settings app has the Extensions subsection in the “Privacy & Security” section.
Once I went to System Settings > Privacy & Security > Extensions > Added Extensions the DEVONthink extension actually shows up and I could enable it there and it shows up in the list of sharing extensions e.g. in Safari – problem solved!
Interestingly, if I now go to Edit Extensions in the Sharing menu, I STILL do not see the DEVONthink extension (will check what happens after I reboot later)!
That unfortunately means I cannot re-order the sharing items and move the DEVONthink sharing up to the top, where it belongs 
Very strange, so this must be a real bug in MacOS, probably since Ventura!
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Thanks for sharing that information, no pun intended 
Just FYI, this happened to me today. I turned off the full disk access in ‘privacy and security’ and turned it on again. I hardly use the share menu anyway but that worked. I think it has dissapea red before but came back ‘on its own’ due to an update or whatever…
Thanks for the report! Details are always appreciated.
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Unfortunately, I’m experiencing the same problem on my new Mac Mini with macOS 26.1 and DT 4.1.1: DT isn’t displayed in the “Share” menu, especially not in the “Preview” app. DT was installed normally and is located in the Applications folder, with full disk access enabled.
I think this is related to the problems with the Safari extension. Have you tried the Sorter approach? https://discourse.devontechnologies.com/t/extension-doesnt-save-to-pdf-only-as-a-bookmark/85445/4
Same thing today with me, I see this is a standing issue with Safari probs? In case this is of use to you…
Again turning ‘full disk access off and the back on again restored DEVONthink to the ‘share’ Safari drop down menu. However I don’t do that every time I want to use the ‘share’ option obviously and I use other methods mostly anyway.
I use ‘print’ a lot, it is more appropriate for what I need sometimes and the New York Times for example seems to often ‘block’ the results if I use the Safari Share thing anyway.
DEVONthink seems to appear and disappear intermittently from the share menu regardless of what I do, but I haven’t detected a correlation with anything else. I don’t bother much about it since it doesn’t really matter in my workflow much.
I also get, if I try to move things from Photos to DEVONthink, this
the photos move into DEVONthink anyway though but I have to dismiss that window by clicking ‘OK”.
Nadolig Llawen anyway to all of you. 
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What version of macOS and DEVONthink?
Both the latest versions as far as I know. Tahoe 26.1 and DEVONthink 4.1.1
My last machine was transferred to this one and I can’t remember when I last did a clean install to be honest. Years and years.
26.2 is current version. have no idea if that would fix issue but my hunch it is something controlled by the operating system. Perhaps troll the internet a bit.
Thanks, I don’t care really, searching about it is more time than it is worth for me, it was a FYI about the issue for the team really. I am sure it is the operating system too and I did have ‘automatic updates’ on. Goes to show. I would quite happy actually if Apple slowed down their development. The system have done what I need for a couple of years now at optimum level. I haven’t got into AI at all though and won’t until I am really forced into it.
So say we all ! 
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