If there’s a placeholder in your slide: yes. Pickit will then insert the image to the selected placeholder into your slide. It also works together with the PowerPoint designer that helps you with design ideas for your slide.
If you are a business user, you (as an administrator or owner) can upload your own templates and documents to Pickit, and share it with your colleagues. You can read more here: https://blog.pickit.com/share-your-company-templates-and-documents-with-pickit
The Documents feature is still in an invite-only beta phase. If you have a Pickit Business account and want to try it out now, you're welcome to request early access here.