I am running into a frustrating issue attempting to import Canon RAW footage from a C500 into Premiere. The workflow is:
On set, the cards are unloaded using Edge onto portable SSD drives.
Back in the editing room, the hard drive is mounted, and I use Copy and Create Proxies (ProRes Medium proxies) to move the files from the hard drives into the editing system.
This… almost works perfectly. The problem is that sometimes Media Encoder doesn't actually do the "Copy" part; it leaves the link in place to the external SSD drive, although it does create the proxy. It's easy to spot these in the Premiere project, because they still have the "CLIPS001" name instead of the proper clip name. I can re-select those, redo the Copy and Create Proxies, and it works, but it's annoying to have to redo them.
Not sure what's going on, but I would do a full file copy over to the editing drive (with a checksum if possible) and then dive into proxies once the SSDs are dismounted. I know it's an extra step but it would eliminate any headaches or doubt.