@Eduardo Mercovich (él)

I think it probably would be easier & more flexible in the long term to deal with multiple files.

However, as it sounds like you're having difficulty with version control, I'm going to suggest keeping it as one file for now.  You can always split it later once you've got the hang of the version control more.

I'm also going to suggest that only you should commit updates to your thesis - this makes your life easier but also there may be worries about you not actually doing your own work otherwise.
# tem25

@edumerco @jamie you might have thought of that, but just in case ... Depending on the country's laws and how the data was collected (is anonymity ensured in what you would share), I would also contact an ethics oversight body (e.g., institutional review board in the US) to check if such sharing is allowed, and if it is permissible to upload the data to a database outside your jurisdiction. Human subject research data cannot be openly shared in many countries.