I made the original graphic in a different .svg file. I imported that file to make a new one, where there are 4 copies of the original graphics now. Each one is considered a single object. I made the graphics with copyright-free vector drawings I found online. I did all this work on my laptop.

the problem is that when I export the file to pdf, it comes out mostly blank. A lot of the graphics comes out missing. I attached screenshots and the export options I used. Please help, I don't know how to fix this.

It's common for masks in Inscape designs to clobber output for PDF. If masks are the issue, I'd use other methods.

dang, alright. I'm trying to print this on my printer tho, so how can i ensure the file (example, .png) prints to the right scale

I always print from pdf, so I'd use clips or other methods instead of masks. Printing from Inkscape has historically been unreliable.