Google Chrome/ Edge: The file cannot be updated

[verkruemelt]

New Problem with PDF preview image generation, when Chrome or Edge is used.

Getting the Message Block error: "The file cannot be updated" in block type: "pdfpreview" instead of the the JPG.
The image already exists, so the fileMethod isn’t involved anyway.

But Firefox works totally fine.
Any Ideas why this happens?

[rasteiner]

For context:

Template for PDF preview image

I followed Sonjas Cookbook to create PDF preview images. I want to add a template to the generated image. To apply the template I added the ‘template’ in the return value of the 'preview in the index.php: return new File([ 'filename' => $previewName, 'parent' => $this->parent(), 'template' => 'pdf-preview', ]); } How can I assign the template to the preview image?

[verkruemelt]

I was able to isolate the problem. It’s not the browser itself, but whether I’m logged into the panel in the particular browser or not.
As an ‘anonymous’ frontend user, I do not have permission to update the file.

How can I allow a user to update the preview image?

[thguenther]

You can use $kirby->impersonate() for that:

$kirby->impersonate()