Mega uses e2ee and is available in all platforms I use. I don’t use apple. Web interface is very functional. I think it does support sharing files via link. Should have a search feature also, never used (because I know exactly where I keep my files). It does sync with locals. I don’t know about android file picker.

Mega is not a good choice for Lemmy users or Foss activists, probably because of its history - which is not as clean as say next cloud, but is not like google either. As long as it works :/