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Power Platform Community / Forums / Power Apps / Bug: Malformed Base64 ...
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Suggested Answer

Bug: Malformed Base64 string on Android 16 using Pen Input control

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Posted on by

Hi community,

I built a canvas app in Power Apps that works perfectly on Android 15 and older devices. However, when trying to run it on a new Lenovo Tablet (Model ZAEH0120MX) running Android 16, the application crashes on startup and immediately throws the following error: "Malformed Base64 string".

The issue seems to be natively caused by the Pen Input control. When the app attempts to store the .Image property into global variables, it creates a compatibility or security conflict with Android 16's rendering engine. My formulas are clean and protected, but the native behavior of the control crashes the app before any screen loads.

Is this a known bug with Android 16, or is there a specific workaround? Any help from the product team would be greatly appreciated. Thanks!

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  • Suggested answer
    CU15080535-4 Profile Picture
    25 on at
    Hi,
     
    This is known issue.  Use the Pen Input Strokes property instead of the Image property. Store it like this:
     
    Set(gblSignatureStrokes, PenInput1.Strokes)
     
    This avoids Android 16’s Base64 crash entirely because strokes are JSON, not image data.
     
    Please marked answered if it is resolve your issue.

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