[HOW TO FIX] “Invalid main files” error when uploading a character

Marko_ADSK — Thu, 13 Nov 2025 22:28:32 GMT

When uploading a custom character to Flow Studio, the error message appears.

Re: [COMMON ERROR] “Invalid main files” error when uploading a character to Flow Studio

Marko_ADSK — Thu, 13 Nov 2025 19:01:03 GMT

This error typically occurs when you're using an outdated validation add-on or when you've modified files after completing validation. To resolve this:

Remove the previously generated '01_wonder_studio_character_data' folder.
Download and instal the latest version of validation add-on.
Validate your character through the add-on, and do not modify the character or metadata.json files after validation.
Upload the newly generated files to Flow Studio.

Here's a direct link for downloading the newest add-on version: Install the Validation Add-on

topic [HOW TO FIX] “Invalid main files” error when uploading a character in Flow Studio Forum

[HOW TO FIX] “Invalid main files” error when uploading a character

Re: [COMMON ERROR] “Invalid main files” error when uploading a character to Flow Studio