Hi, I'm posting this here in case any other R6 users have had similar issues (I've also created a seperate thread for this in the RAW, post-processing part of this forum:
I bought a Canon R6 recently and the last two times that I've used it, I've run into the same problem. Upon downloading to the computer, some of the files (CR3 format) come in just fine, and some either show in the thumbnail previews as blank (using Photo Mechanic) or with a large question mark (using DPP). I have not yet re-formatted the SD card (thankfully), and when I review the photos in-camera the images show up just fine.
I first downloaded using Photo Mechanic and thought that there may be a glitch with that software, so I installed DPP on my computer and as indicated above, DPP doesn't seem to recognize those files either. But I have not tried re-downloading the files using DPP - is it worth trying that ?
Any advice is welcome. The photos in this batch are basically irreplaceable, as this was for a very special event. If anything else, I've learned that in the future I should probably save a JPEG as well as RAW for these instances.