We might get the below error while using the pen control.
Just make sure that we have set the field to the minimum length recommended by Microsoft i.e. 15000.
The maximum value that can be set for the text area (multiple line of text) field is 1048576.
Earlier pen control was not available for the Web client.
But now they can be enabled for the web as well.
Hope it helps..
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If you’d like to be warned of this issue by the PowerApps Checker please upvote this idea to Detect Short Signature fields: https://powerusers.microsoft.com/t5/Power-Apps-Ideas/PowerApps-Checker-Detect-short-fields-used-with-pen-control/idi-p/421359