I got your file
issue 1 = the file is too big for cloud rendor... not that you have anyway to know that
another point is that hidden layers show up in a rendor as shadows so you need to remove them... I see you are a Mac user so I sent you back a link to the rendor in case it comes in handy


issue 2 is missing textures and that could be a unsupported file type like Tiff or Bmp but that would crash Dimension and corupt the save so I assume you used Png but you have them stored in a locked location like a portable drive which is a known issue for Mac
the bad news is I can't really repair this because I don't know what you want the image to look like
the good news is that if you replace the textures or pick a colour then Dimension will rendor the image fine (local)


ime big files like this are not normally worth the extra effort and 1024 or 2048 squares tend to be all you really need but its your file mate
p.s, if you want to send me a copy of the Dn file with textures \ colours then I'm happy to rendor it on my Ryzen for you