Using DT4b2, whenever I capture using the share dialog, DT4 always creates a bookmark the first time round, regardless of the Format selected (Markdown, for example). Once created, if I repeat the operation a markdown (in this instance) is created.
This is just for notification purposes and bug tracking.
And what about when you use the proper browser extension?
I try to avoid installing extensions unless absolutely necessary. I much prefer the share sheet. Plus, this is in Safari and I don’t see an extension for DT 
For infos, this was not a problem in DT3 - and still not, if I run DT3 instead of DT4b2. So there is clearly a difference.
The extension is already installed. You just need to enable it in Safari’s Settings > Extensions.
Also, you should not have version 3 and 4 on the same account on the same Mac.
ok. That makes more sense now.
Yes I can see both extensions. I’ll uninstall DT3 (app & extension) and I’ve enabled the DT4 extension now.
If you’re choosing to use the beta of DEVONthink 4, just delete the DEVONthink 3 application. Do not run any uninstaller applications.
All good. Thank you for your prompot responses and the pointers to help.
You’re welcome 