How to fix merchandise not displaying and oversized logo issues?

Hello everyone. I am having some trouble with my new shop. I keep getting messages from Shop saying that my merchandise is not showing up in the shop. But they’re not telling me how to fix it. Also, I designed a logo and when I put it on my Shopify to edit it, it looks perfect but when I apply it it’s way too big. I’ve tried everything. I can’t seem to figure it out.