Seafile is available under several clients.

Below is the Seadrive client :
Client Drive (Seadrive) Procedure
There's also the Seafile client :
Synchronization Client Procedure
Finally, the procedure for the web application :
Web Client Procedure
There's also a smartphone app :
Procedure Application Seafile

Below is a more complete documentation covering the above points :
https://seafile.igbmc.fr/f/6fe242ed4311443c8a6c/

Linux installation procedure :
https://seafile.igbmc.fr/f/d47796bbe3d24c7580a0/