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Does the LWC component support pre-validation before file get uploaded? I checked the js library doesnt seems have any way to do the validation.

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No, it does no pre-validation at all. It is essentially just a mechanism to upload files to a record. If you want comprehensive validation, write your own component instead.

  • Apex has limit of 6mb. I need to upload a file up to 20mb. Is there a way can do that? – Kelvin Huang Aug 18 at 23:17

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