Help, why is the modifier not applying after being applied

Hey, i’m currently working on a school project, i’m currently trying to attached the modelled assets to the character, I applied Data Transfer and armature modifier, but after applying the assets are still not attached to the rig model.

Also, is there a way to make the file less laggy?

Hi, you are probably not parenting the right way, watch this tutorial:

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Thank you for the link