Whenever I try to add attachments to my paid posts, I get a pop up that says “Leave site? Some changes you made may not be saved” and gives me no choice but to click it every time, making it so I am unable to add attachments to my posts. This goes for all attachments .jpeg .zip .png all of em. My rewards include photosets so this is a big issue 
Hey @co5mically,
Nick here from the Patreon Platform team.
This is an issue better suited for our Community Happiness team as these forums are more geared towards technical issues with the Patreon API, rather than general product support.
The Community Happiness team can be reached at https://www.patreon.com/faq, they will be able to better assist with this.