Hello @oui
Almost EVERY forum distro comes to you with SAMBA built-in. SAMBA is ubiquitous in EVERY major Linux distro such that there is NO need to install anything on Linux distros. Its built-in, stable, secure, simple to setup and easy to understand such that almost every member of this forum can help you with setup and understanding it.
On your forum linux distro
If you haven't already, merely open it to your forum distro's desktop and share a location that you want to allow users to store/retrieve files. This is done, usually ONCE in the life of your PC. For WoofCE PUP's on the desktop go to Menu>Network>SAMBA Simple Management and setup a store location or use the one that is pre-built making sure the service is started via its button (GREEN). The forum developers of this made this almost TOO easy to both understand and to use.
Once this is done, your PUP is sharing a location that anyone on your LAN can send/receive files to that storage location.
On your phone
For the past many-many years, I ONLY have used Android file-managers which have smb-clients built in. They are numerous! These file managers have features built-in such that (assuming the phone is on the same Wifi network as your PC) you can retrieve or transfer files to/from your phone with ease.
To do this, there are more than a half-dozen free file-managers and at least a dozen that you can purchase for less than 4-pounds. Using one of these (your choice) you open it, link to your PUP's SAMBA resource it is sharing; then read/write files.
Conclusion
Any of your phone and PCs can pull/push files to your PUP. Most every member of this forum knows how to do this and can help should you need.
Further, I have NEVER needed to use a physical cable OR a physical media (micro-SDcard, USB sticks) to exchange or transfer files to my PUPs where SAMBA is running...NEVER!
Hope this is helpful