I’m new to Figma

I just completed my first full campaign proposal design, it’s clear there are issues in the UX with exporting. 

• creating a frame around a social media post after designing it (rookie mistake, maybe?) and the whole design is resized to “fill” or auto layout messes up the entire post
• I set up templates to follow before doing the design. So I had a bunch of white 1080X1350 rectangles to design over. When exporting some of the frames, the white rectangle I used to outline my aspect ratio before doing any design shows up on the sides (unevenly, mind you this would have been v embarrassing to send to a client) but not on all of them. it’d make sense if this happened on every post but this was oddly only few and easy to miss at a glance (time added to my QA).
• I want to be able to bulk export all of my frames to individual jpegs, this is super time consuming to go individual frames and then deal with the export issues case by case. 

*end rant, and thank you for your time*