Connect your phone to your PC while still in TWRP. Your phone should appear as a storage drive.
Disclaimer: This guide is for educational purposes. Rooting and flashing custom ROMs can brick your device. The author assumes no liability. samsung a13 5g custom rom
If your phone stuck on the Samsung logo, boot back into custom recovery and perform a "Format Data" via the wipe menu. This fixes encryption conflicts. Connect your phone to your PC while still in TWRP