A document (‘formatted note’ or RTF) seems like it’s editable the moment you tap it, but really it isn’t. If you tap a document, the virtual keyboard slides up into view, you can select text and appear to edit it (e.g., add to it, change it, change style to bold, etc.), but on going back to the group (via the group name at top left) and then returning to the document, you can see that no edits have in fact been made. So what’s the purpose of the virtual keyboard sliding up, and the availability of the styling popups, etc., etc., when you tap on a document?
To actually edit it, you have to tap the ‘edit’ button at top right. But then, when you try to edit the top line of a document (or select all of the document, so that the top line is also selected), the OS’s “white-text-on-black pop-up” obscures all the icon-commands, so you can’t access them. Can’t those icons inhabit an added sliding row on top of the virtual keyboard, as one sees in many apps?
Also, if you do use the ‘edit’ button at top right, and actually edit it, when you’ve finished (assuming the popup hasn’t obscured the commands that you needed), then, to save your changes, you need to tap a white cross inside a blue circle at top right. Shouldn’t that icon be replaced by “Done”, like any other app? A cross doesn’t imply ‘done’.
Most of the time, DEVONthink callback links don’t work in RTF or 'formatted documents’, neither are they editable. (I set up a load of documents to use their internal links on iPhone, only to find they don’t work!) Very often the links just disappear anyway, the next time you visit the document you inserted a link in. The only time they seem to work, after being inserted, is if you tap the top right ‘edit’ button, then tap the ‘cross in a circle’ icon (thus not actually having edited anything).
For non-downloaded formatted notes, the “Download (N bytes)” info-link on the screen doesn’t work; instead you have to tap the “ellipsis in a circle” icon at bottom left and choose ‘Download’.