Is it possible to use an image URL as a page preview in the panel?

[pixelijn]

You cannot convert an external file URL to a file object using toFile().
Are these URLs pointers to external files or are they URLs to actually existing files in Kirby’s folder system? If external see:

Virtual Files for page?

There’s another way to handle that: Spacer GIF Just kidding! Almost. Use a file create hook to upload the file to azure or whatever and once the upload succeeded, replace the actual file on the disk with a 1x1 px version. I have done this a couple times in client projects and it works pretty great. You can store additional meta data in the text file. For example the original dimensions or a reference id of the uploaded file. Another way is really working with virtual file object…