Iconic Encounters: B4 - the Lost City

You're absolutely right. I've corrected that and uploaded a new product file. I also updated some of the larger maps to a newer jpeg version, so they aren't quite so large any more.

I'm guessing you mean the floor tiles. Hopefully the walls all line up properly. But yes, the sliding wall section is intended to move down the entire hall, but since there are small variations in the floor pattern, depending on where exactly that section is sitting it might look like it deviates from the pattern or it might not. In most virtual tabletops, a reasonably good strategy is to increase the opacity of the grid, which obscures the breaks between squares and tends to make the pattern change unnoticeable. If your VTT has dynamic lighting, that also goes a long way as the shadows and variations in light make small graphical anomalies less apparent.

Is there a specific file you're having trouble with? There are a few possibilities here: You might be trying to upload a file larger than what your membership level allows (I believe it's 5MB for free or 10MB for paid), or you might have reached the storage limit for your membership level so Roll20 won't accept any more uploads, or there could be some technical problem with your browser or web connection. But I've successfully loaded all the included maps to Roll20, so I guarantee there's a solution.