What services/tools are folks using for cross-platform file sharing? My household is cross-platform (wife is on #macOS, I have an old macOS system I keep around, and the rest of my systems are #Linux) and I don't foresee that changing any time soon.
LocalSend: Share files to nearby devices

LocalSend is a free, open-source, cross-platform file sharing tool that allows you to share files to nearby devices.

@ErikBussink I do use LocalSend now, but only for myself. Getting it installed on her Mac is probably a good idea.