Using PnP provisioning engine results in empty template

I am using the PnP provisioning engine according to
https://docs.microsoft.com/en-us/sharepoint/dev/solution-guidance/introducing-the-pnp-provisioning-engine

the article makes it sound so simple that it's just a matter of executing two commands, but when I tried to apply my template, I got just the homepage updated, with broken images, in the webparts and the logo isn't copied, the other site pages aren't copied. I checked the result .xml file from the Get-PnPProvisioningTemplate, and it's missing the site pages and other assets. 

Are there other resources out there showing how to actually use the provisioning engine since I followed the docs exactly as they say and got a broken result?