Failed to rename file: Permission Denied

Was watching a stream from my PC, and my father-in-law was watching the same channel on his Apple TV via the Channels DVR app. Stream stopped on my browser. Running the DVR app on a diet-pi VM that acts as my media server. Permissions are fine for other apps that write to the remote share that is mounted on the linux install. Are there any other permissions I need to set? I did add the user to the proper groups that are listed in the install guide.

Snippet of log:

2020/02/09 21:42:15 [HLS] Starting transcoder for channel 6001 from 192.168.0.30 (encoder=remux, resolution=, deinterlacer=, bitrate=10000)
[hls @ 0x3aa2400] failed to rename file /mnt/Video/DVR/Streaming/ch6001-dANY-ip192.168.0.30/stream.m3u8.tmp to /mnt/Video/DVR/Streaming/ch6001-dANY-ip192.168.0.30/stream.m3u8: Permission denied