When you encounter a document upload area within a permit application, you will see a button labeled "Select Files", inside of a light grey rectangle that also includes the words "Drop files here to upload" on the far right of the light grey rectangle.
You can click the "Select Files" button to use the file explorer/manager of your computer to locate and select the file you wish to upload.
You can also click on a file with your mouse, drag the document anywhere within the light grey rectangle, and release your mouse to initiate the upload.
If you accidentally uploaded the wrong file, you can click on the "X" to the far right of the file to delete it.
Notes
Depending on the permit application you are working in, the document upload feature might allow either a single file or multiple files to be uploaded into the corresponding field.
Some document upload fields are required, meaning that you will have to upload a document into that field before you can proceed with the application.