Do the instructions here help?
You may need to add settings to your appsettings.json, but I think typically the defaults are good enough to get started.
So, the whole 'create a button' instructions, that for if you want to open it from a custom page? As opposed to from within the CMS?
Not sure, TBH -- I think that might be more for creating a custom property type that uses the DAM picker, for example, or (like your example) external from the CMS.
Im tryig to follow the instructions for integrating the Welcome DAM Library picker. The instructions state that I should create an HTML element with a buton for opening picker. But there is no description of where I put this HTML. In general, the instrcutions seem to be missing several important steps on how to actually implement this on y site. Has anyone successfully implemented this?