What device are you editing on and what operating system? What happens if you copy the video to the device itself rather than trying to link to it on Dropbox?
What is the audio and video format? If you open the DSLR video in the free download MedaInfo, set View to Text and then copy the report it generates and paste it to this forum we'll better be able to tell you if the issue is related to the video source and codecs.
I'm having this issue on Android latest as of today (188.8.131.5276). The video isn't RAW, it's h264 avc @4k30 according to VLC. The audio is the issue, which is "DVD LPCM" or lpcm. This seems to be a very common codec, as far as I can tell this is the same as WAV. The files are coming out of a Fuji ILC (xh1).