Minecraft players can modify their gameplay experience in a multitude of ways and across different editions, thanks to Java Edition mods and Bedrock Edition add-ons. Your login session has expired ...

You need to have the game's Java Edition to add the mods. Bedrock Edition does not support mods and can only get add-ons that offer limited features and functionality.

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If you're doing a double-take because you thought Minecraft already had "add-ons," you're not wrong. That's how it had been referring to community-made additions for Bedrock already.