Hi i am using The theme Dawn which says it supports product video uploads. however when i try to upload a video in the product section it comes back to tell me that i cant upload my file and that i might need to possible update my theme?
Depends on what dawn them you might be using, if it is outdated or not
go into the shop free themes under your themes section in shopify and download the lastest theme
also it might not support mov files but mp4 files that are anything less than 20 MB