Hmmm, come to think of it, it's true that the formatting is not always perfect when coming from Word files, etc. I didn't even know Onlyoffice existed.
Looking at their github, I don't see a gpg public key file and a checksum file which I usually prefer to have before putting anything on my computer. Apt-cache on xubuntu doesn't seem to show that it's part of the repositories.
I'll try to find the verification files somewhere. If you know where I can find them, please let me know.
They aren’t in the repo unfortunately, as Ubuntu distributes them as a snap 😥
They are also available as a flatpak
You can also add their repo (includes gpg):
https://helpcenter.onlyoffice.com/installation/desktop-install-ubuntu.aspx
Thank you! Yeah, I'm less a fan of snaps and flatpacks but the repository alternative is interesting.
I asked the livechat for the checksum but they referred me to their forum and this answer in the forum says they don't have the checksums https://forum.onlyoffice.com/t/download-file-verification-checksum/890
Good thing that they have the repository option. Thanks!