White Screen and Failed Data Fetch

[arnebjoern]

Hi,
I am using the PixelArtConverter (versions 1.0.8 and 1.1.0 Beta) on a WLED-powered ESP8266Wroom. Two major issues occur:

After uploading the pixart.htm file to the ESP, accessing http:///pixart.htm only shows a white screen.
The "Get from Cloud" feature in the PixelArtConverter fails, even though the JSON API (http:///json/state) works correctly.
Troubleshooting Steps Taken:

• Tested JSON API:
  Accessing the API directly in the browser returns valid responses, confirming the API is functioning properly.
  File Upload:

-Uploaded pixart.htm (normal and beta versions) via http:///edit.
Result: Only a white screen is displayed after uploading.
Checked Filename and Storage:

-Verified the filename is correct (pixart.htm).
Cleared unnecessary files to free up storage space on the ESP.
Checked Network Connection:

-Both the ESP and the computer are on the same Wi-Fi network.
Accessing the WLED web interface and API works without issues.

-Tested Firmware Versions:
Tried both WLED 0.14.0 (stable) and 0.14.0-b1 (beta). The problem persists.

-Ruled Out CORS Issues:
The file is loaded directly from the ESP (no HTTPS or external server), so there should be no cross-origin restrictions.

Questions:
What could cause the white screen after uploading the pixart.htm file to the ESP?
Why does the "Get from Cloud" feature fail, even though the JSON API is accessible?

Thank you for your help! I appreciate any guidance or known solutions.

PS
If I copy the JSON payload manually into WLED’s preset interface, I get a Syntax Error.