Sounds kind of complicated. I've been using the File Manager Plus app on my Pixel 4a phone. I just click the option "Access from network" to set the phone into FTP device mode. Then I just type the ftp address into windows explorer file manager and copy the files over. Its actually easier than that as I have a shortcut on my desktop with all the info already entered into it, so 2 clicks on that (or 1 if I add it to the taskbar) and I'm ready to go. You can vary the port in the address if you want and add a password for security if that's a concern. And with windows file explorer you can browse all of the storage folders on your device to see what's there. Plus open 2 file explorer windows and drag and drop files between devices.
(This latter part is especially important with a Pixel 4a phone since if you try to use a usb c thumb drive to transfer files you're limited to the 4 GB file size that's allowed under the fat32 formatting that Pixel 4a demands on thumb drives.)