From the ZenTransfer Blog

While file formats can be transferred with ZenTransfer?

See a list of the file types that ZenTransfer can handle

ZenTransfer is designed for professional photographers and use in their workflow1.

Supported file types

ZenTransfer will accept photos, videos, audio, and text files. Any other file type will be rejected by our servers. The files are verified first by extension, then by file signatures and format verifications to ensure the files are valid.

Supported RAW files

ZenTransfer accepts the following RAW files2:

Camera Brand File Extension MIME Type
Canon .cr2 image/x-canon-cr2
Canon (newer models) .cr3 image/x-canon-cr3
Nikon .nef image/x-nikon-nef
Sony .arw image/x-sony-arw
Panasonic .rw2 image/x-panasonic-rw2
Olympus .orf image/x-olympus-orf
Fujifilm .raf image/x-fuji-raf
Pentax .pef image/x-pentax-pef
Leica .dng image/dng or image/x-adobe-dng
Hasselblad .3fr image/x-hasselblad-3fr
Phase One .iiq image/x-phaseone-iiq
Sigma .x3f image/x-sigma-x3f
Adobe (universal) .dng image/dng or image/x-adobe-dng

Footnotes

1ZenTransfer is not intended as a universal file transfer solution. We see interest from other use cases, and if you believe ZenTransfer could be useful for you for other settings, please contact us on hello@zentransfer.no. 2ZenTransfer does not process RAW files, but it will extract and display the embedded thumbnail if there is one present in the file. It will also generate thumbnails from JPEG files, but treat any other file type as generic files without thumbnails.