Use three-dot menu on the collection of your selection or click "Preview" use "Import" button on upper right.
Collections page
Preview of collection
A popup will appear asking if you have your template file. This guide will assume that you do not have you template file.
Click "No". Arrange your template file on the next popup.
Step 2 - Arrange Your Template File
Click "Download" after arranging your template file. Extract it, fill in, compress it again to a ZIP file.
Step 3 - Upload Your Template File
Select whether or not to replace your existing screenshots/previews in your selected collection. For empty collections either choice makes no difference.
Select "Overwrite screenshots/previews with imported ones" , select your template file upload it.
Import process
Summary
After importing process a summary popup will appear indication any errors and invalid items.
