I bought a CF Express card for use with the Nikon D850 after a firmware update that enabled it. I used it here as a replacement for the XQD card. No problems with image transfer; actually pretty fast for transferring large images (until video is used for me). My travels usually take me to national parks and forests where I walk around with this SLR. I'll let you know if there's a problem with the hundreds of pictures I usually take throughout the day.
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