If you want to attach more than one file to a record,then you need to create multiple fields with the attachment data type.

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Quizplus · Accepted Answer

Salesforce allows users to add multiple attachments to a single field with the data type "Files". This feature was introduced in the Summer '19 release. By using the Files related list, users can attach multiple files to a single record without needing to create multiple attachment fields.

If You Want to Attach More Than One File to a Record,then