After opening and editing a file, I can’t seem to find a way to Save or Save As; even tried the back buttons, they exit but don’t offer Save/Save As either.
What do you advise? Thank you
Hello @c0331086 welcome to collabora online forums.
Both the options are in File tab. You can also user keyboard shortcut (Ctrl + S) to save 
For Phone/Web version: In the top left corner, we have Save option
Thanks,
Darshan