I have custom Opportunity form using lightning-record-edit-form. I want to redirect to Pricebook selection page after successful saving the record. This is possible in classic pricebook selection page. But I need that in Lightning.

I am using Dev instance where Platform Encryption is enabled. When attaching the file to relevant record, it will encrypt the files before storing into Salesforce Db. But that attachment file is still visible to another user.
My Question is how to show encrypted the uploaded files attachment to specific user who dont have "View Encrypted Data" permission. 

Attachment Files must be seen in plain text only who have 'View Encrypted Data' Permission.

I have custom Opportunity form using lightning-record-edit-form. I want to redirect to Pricebook selection page after successful saving the record. This is possible in classic pricebook selection page. But I need that in Lightning.