If you have a Sandisk SD card in your Canon EOS R5 II, you may want to check that it's compatible. Canon recently put out a warning, reported by The Digital Picture, that "certain SanDisk Extreme PRO ...

How to recover lost deleted formatted pics video files from Sandisk Kingston Transcend Toshiba Panasonic ... Micro (M2), MultiMedia card, MMC card, SmartMedia, flash card, xD Picture card, ect. A good ...

Introduced in 1999 by Panasonic, Toshiba and SanDisk, and managed by the SD Association, the SD card superseded the MultiMediaCard (see MMC). Capacities have reached 1TB. See microSD and flash memory.