How to convert attachments to files in salesforce ?

Scenario

I have uploaded an attachment (salesfiorce_migration_guide.pdf) to an opportunity record from classic salesforce. The uploaded document record has the following actions where ‘view’ action is a link to download the file.

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Uploaded attachments to an opportunity record

Next, uploading another file (router-sample.pdf) to the same opportunity record using upload file functionality in lightning. The uploaded files in the above and current scenario are shown below.

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