Windows network sharing is fine but maybe you don't want to bother setting it up and then removing the share. Or maybe you are on Linux and Samba is being difficult. FTP is a good option.
I don't use an FTP server often and forget how to set it up. This is simple but here it is.
No install necessary - stand alone.
Start Xlight and add a server. No need to change the Dynamic IP.
You can check the actual IP by clicking the drop box arrow.
The server list will show IP 0.0.0.0 unless you actually choose the actual IP but it will work fine.
It is handy to choose the actual IP to always see the connection address.
Click the guy in the top menu and set up a user and folder.
Anonymous and no password works fine or use a name and password.
This is where you set up login, password and home directory to share.
Anonymous with no password works fine on local network.
Click the icon next to browse under Home Directory
Xlight defaults to read only so if you need to copy files in both directions "write" needs to be checked.
The "write" setting can be changed later by clicking the guy again, clicking the edit icon on the right, clicking User Path, double click the virtual path.
Wow, that's a lot of clicking.
Access from another PC with an FTP client like Winscp or Filezilla client or
browser "ftp://IP Address:21
Set Winscp to ftp
Install client of Linux (sudo apt install filezilla)