Press Loft doesn't currently have a way to bulk upload and caption products but you can create one listing and clone it to save time.
Cloning copies all of the information from the copied listing in place. From there, you can tweak and publish.
How to clone?
Create your first listing, and then go to the image you would like to clone and click on Clone from existing product as below.
Start typing the image you would like to clone and click on the product you would like to clone.
This is the copy of your listing.
You can make changes as necessary: Title, Keywords, Links... Click Save when you're done.
The new product will then go live for journalists to select.
If you have any questions, please get in touch with the team at firstname.lastname@example.org