Common mistakes when uploading PLY 3D models include using unsupported formats (e.g., binary on ASCII-only platforms), missing linked textures, and incorrect vertex normals that break lighting.
Unsupported formats are a top issue—many tools prefer ASCII, so binary PLY often fails to upload. Forgetting external textures referenced by the model leads to missing materials. Bad normals (from poor export settings) make models look flat or distorted under light.
Test small models in both ASCII and binary first to check compatibility, textures, and lighting—this avoids most issues before uploading larger files.