hi!
when i tried before to access my files on my iphone after saving to dropbox on the collabora app for my chromebook, the files would appear but be greyed out/untappable. i tried both docx and odt and neither would work.
but i decided to uninstall collabora to see if maybe it was just a glitch (then promptly forgot to reinstall it… oops). anyway, everything seems to work fine now that i’ve reinstalled the app on both chromebook and my iphone.