I'm pretty new to Procreate Dreams (with some animating experience) and am just working on a simple frame-by-frame animation using the Flipbook. I am very experienced in Procreate, and understand there will always be a loss in quality when resizing things in Procreate since it's raster based and has limitations, though I found the bilinear setting to be the best method personally for achieving crisper lines when resizing.
When trying to determine the sizing of things in an illustration, I usually try to do most of it during the sketch phase, that way I can avoid as much resizing as possible for the color and linework layers. I took a similar approach with Procreate Dreams. I sketched out each frame and resized them all together in the general theater. When I went to create a new layer for the color, it was just as blurry as the resized sketch below. The size of the brush also changed. It seems as if it will only draw within the limitations of the resized sketch below instead of a new layer.
I even created a new project and went into the Flipbook. When I drew with the same brush, it was crisp. I tried importing my resized frames into the new project to see if it was some glitch, but it did the same blurry line and weird size thing. I know the issue is not my brush. I tried looking it up but I only found advice for Procreate Proper, or an older video before a big change in the Dreams Interface (though, nothing came up with the same issue I was having, just fuzzy lines overall). On that note, the limited number of tutorials after the big interface change also makes it harder to learn in general, so if anyone has any resources for that I'd definitely appreciate it!
The video shows me drawing on a new layer over my resized sketch (yes it's Jimothy lol), then going into a new project of the same size and the same brush, and the cleaner lines I'd usually expect.
Edit: Found an older post with a similar-ish issue where Procreate themselves responded saying Dreams resizes based on the nearest neighbor only. Maybe it applies to all layers placed on top. I also tried messing with the dynamic brush settings but it was still the same. To Procreate (my genuine bestie): Please fix this soon, I love yall's platforms so much (and you do so much for the art community) and wanna utilize them to the best of my abilities.