Same problem with Simple scan, the file appears when scanning, but then autoreset when finishing the process. Seems a bug.
What I did recently with imagescan, if it can helps you, is install in Ubuntu 20.04 "imagescan-bundle-ubuntu-19.10-3.62.0.x64.deb.tar.gz" following the usual process:
Put the archive in your personal folder.
tar xaf '/home/youruser/imagescan-bundle-ubuntu-19.10-3.62.0.x64.deb.tar.gz'
cd '/home/youruser/imagescan-bundle-ubuntu-19.10-3.62.0.x64.deb'
./install.sh
rm -r '/home/youruser/imagescan-bundle-ubuntu-19.10-3.62.0.x64.deb'
Reboot.
Start your printer.
Run gscan2pdf.
Click on scan icon. The program starts to find drivers and should appears something similar like "EPSON FW-2750_Series". You can then configure the program and scan.
Other option is, if you are not able to install scan drivers, scan through wifi, though in Epson I only could install router wifi net with windows drivers before. Then I could install wifi net in linux with some simple changes. I could explain it but this is another process.