It appears that if an RTF file contains an image (like clipboard paste of one), it no longer is editable in Devonthink to Go. It still is editable in the DT on the MacBook.
NOTE - tried to attach an rtf file as an example, but doesn’t seem to be an option here so this is info from inside the test file if you want to duplicate it on MacBook and then sync with DT to Go to reproduce the problem …
"This is a Rich Text Format file.
It has a RTF file extension so far as this line.
<Image is now added here>
As soon as the clipboard image above was pasted, it’s file extension changed to rtf.rtfd,
If the pasted image above is removed then the file name changes back to rtf extension.
Both with the pasted image and after, this file could be edited in the Macbook, Devonthink.
Before the image was pasted, this file also had an Edit option in Devonthink to Go and could be edited.
After the image was pasted on the DT on the Macbook and sync to the Devonthink to Go, there is no more Edit option for the file there and cannot be edited."