Bedrock is often played on mobile. If your Java mod uses 512x textures, downscale them to 16x or 32x to prevent the .mcaddon from crashing the game.
The question "how to convert jar to mcaddon best" is searched thousands of times monthly, but the truth is harsh: However, you can rebuild the mechanics or re-export the assets .
Converting the actual "code" (blocks, items, or entity behavior) requires rebuilding the mod from scratch using Bedrock's JSON-based system.
Converting a Minecraft Java Edition mod) to an (Minecraft Bedrock Edition add-on) is not a simple file renaming process. Because Java mods use compiled code and Bedrock add-ons use JSON-based behaviors, a 1:1 automated conversion for complex mods does not exist
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