Restrict File Upload by File Type in Oracle Apex

If you want to restrict file upload by file type/extension/format you can follow the below steps. 

Goto File Browser Item --> Advanced --> Custom Attributes 

Then pest below code :

accept=".pdf,.csv,.xlsx"

Here it means only pdf , csv and xlsx file will be acceptable for upload. 

If you want to accept only pdf then you have to put like below code as the screenshot given:

accept=".pdf"

  Double-click on the image to view it on a big screen.

That's it. Now you can go and check.