Photoshop on the web shows “Unsupported file format” warning when using the Brush tool with a Wacom pen

Hi ,
Sorry, I selected the wrong category. To clarify, the device is computer.

I’m using the Brush tool in Photoshop on the web with a Wacom pen tablet. When I draw with the Wacom pen, I often get the following warning, as shown in the attached screenshot:

This seems to happen when the pen is touching  surface for an extended period of time while using the Brush tool.

I have already tried the following:

• Set the Wacom pen side button / side switch to No Action
• Disabled Press and Hold for right-clicking in Windows Control Panel > Pen and Touch

However, the same issue still keeps happening.

Is there any way to prevent this warning from appearing, or is there a known fix or workaround for this issue?

Thank you.