I have a Beikell SD Card reader, USB connection. Seems to work OK with 128Gb cards transferring video files but I'm struggling trying to transfer/copy directories from my PC (windows 11) to a 500Gb SD card. (50+Gb size directories). With the SD card formatted exFAT32 it seems to transfer all the files but when I check most of the files are not visible, or if they are then the format,(eg .jpg) is "not recognised". Strangely if I then delete the directory on the SD card it seems to delete all those "invisible" files. I tried reformatting the card in NTFS, transfer was very slow and whilst more files transferred many were still not visible. I assume there is no size limit on the card reader. Any suggestions? (note using a legacy usb hard drive, formatted FAT32, I can indeed transfer a 50Gb directory OK)