How do i recover files from an eMMc drive?

I installed fedora 40 kde a couple days ago to my Lenovo 14e S345 Chromebook, and when i try to use something like testdisk to recover my files, it doesn’t recognize the main partition that i would need to recover anything i had on it. Can anybody give advice or send resources so that i can recover what i needed? I’m still new to flashing stuff to Chromebooks and flashing new firmware.