If you did a run but used more than 1 part, do you submit the link for the first video and have the moderator find the rest?

You could ask the mod how they would want it handled but I'd assume you put part 1 in the video section and then the rest in the description v what ROMaster2 said

Suggestion: When putting in multiple videos, put them in the video field like normal with two spaces between them. That's currently the best way to do it because of how the database works.

I submitted one time where Part 1 was the video linked and Part 2 was my comment (the recording stopped partway through the run, so I resumed very shortly after. The missing bit is nearly irrelevant and the validity of the run was confirmed in other ways, mostly by comparing the consistencies between the two videos). I would recommend either putting the second part in the comments or what ROMaster2 said, presuming it works.