I have this strange problem when uploading a picture onto my gallery for Pride Month as an icon. I commissioned 2 versions of this picture, one with my character wearing a green shirt with a flower on it, and the other without that shirt. For some reason, the picture without a shirt was able to be uploaded, but the one with the shirt can’t be uploaded. The pixel size and file size are about the same and within the recommended limits. I really wanted to make the latter an icon to use.
Contact support at https://vrch.at/support and tell them your image was blocked as a mistake by automated image content scanning for detected nudity, and whether you still want to upload the picture without a shirt. You may also submit a bug report on VRChat Feedback (Canny), attaching the sample images: Bug Reports