We use windows at work, which is annoying as a software developer, and I WFH three days a week. I need some files available on both machines and cloud is the best option. I’m not about to be taking a flash drive between home and work.
If you are comfortable with a cli you could use gnupg. Its man page is good.
If I have cloud storage mounted somewhere I need to be able to drag and drop directories in and out, see the files inside in an unencrypted form, and they should transparently be uploaded encrypted.
This could very well be achieved by a bunch of scripts involving gnupg, but then that's what's I'm looking for, because gnupg by itself wouldn't be productive to use unless as a one-off.
Well it depends on your use case. You could make a script to encrypt a copy of all the files in a directory, make a folder in the cloud storage, and then move the encrypted files to that directory.