Sharing a folder, how does the person I share with upload files from their phone?
You can share with another user via the share option. They will need an icedrive account in order to collaborate though!
In Android, select the “Editor” toggler, and they will be able to upload
For them to upload via their own phones, They will just need to go to the “Shared with me” section, open the folder and use the Floating Action Button as usual