Have you tried copying the files to the local disk before importing?

This is what I always do. Rather than go directly from the card reader or camera into Photos or Lightroom, I copy the files onto an SSD, and then bring them in from the SSD. The entire process goes faster.

I also want to point out that I've seen similar corruption in the past, only in Lightroom. The culprit ended up being hardware, not software. Specifically, the card reader's USB cable. I've actually had two of these cables fail on different readers. On the most recent one, I replaced it with a nicer Micro B to USB C cable, and haven't had an issue.

	▲	PaulHoule 7 days ago \| parent [-]
		I haven't had actual corruption but had imports take an excessive long time or fail to complete in Lightroom because of bad USB cables or (I think) bad USB jack. Generally I'm frustrated with the state of USB. Bad cables are all over the place and I'm inclined to throw cables out if I have the slightest problem with them. My take is that the import process with Lightroom is fast and reliable if I am using good readers and good cables; it is fine importing photos from my Sony a7iv off a CFExpress card but my Sony a7ii has always been problematic and benefits greatly from taking the memory card out and putting it in a dedicated reader, sometimes I use the second slot in the a7iv.

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sib 7 days ago | parent | prev [-]

I use Lightroom, but always with this workflow (copy files from memory card to disk, then use LR to do the import / move / build previews).

If nothing else, it lets you get your card back much more quickly, as a file-system copy runs at ~1500MBps, which makes a difference when importing 50-100GB of photos.

I also don't delete the images off the memory card until they've been backed up from the disk to some additional medium.

	▲	vladvasiliu 6 days ago \| parent [-]
		I haven't tried super fast memory cards, but with why I have, importing by copying from the card maxes out the card (~100 MB/s). Bonus points for the preview generation starting while the copy is ongoing.