I’ve been using pCloud for years and it’s superb.

On a technical level or works exactly how I want a cloud drive to function - only downloads and stores files locally when necessary.

Local cache size can be adjusted so if you work with large files you can increase it.

UI is intuitive

Linux client works without issue, even on immutable OS (Project Bluefin).

Fantastic value for money. I purchased a lifetime subscription and it has already paid for itself compared to annual pricing.

Only negative I have is although there is a open source headless Linux CLI client to work with remote servers it hasn’t been updated in a while and doesn’t support 2 factor authentication. https://github.com/pcloudcom/console-client

I was able to work around this by creating a second free account without 2fa and “sharing” the directories I needed.

It could be implemented the same as most email clients do. A simple message “load external content” with an option to always load.