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Highlight both your Converted_Resource_Pack folder and Converted_Behavior_Pack folder simultaneously.

Microsoft's Marketplace has strict policies against:

file cannot simply be "renamed" or "transcoded" into a working add-on. Instead, "conversion" refers to

Create JSON files in MyMod_BP/entities/ or MyMod_BP/items/ to define the behavior you analyzed in Step 1.

Java uses .png files, which Bedrock supports, but the folder names are different.