Hello gil.rudolph,
Welcome to Apple Support Communities!
To help with the error message you're receiving about not giving access to display your files and documents follow the steps below.
"You can access the data that you store in iCloud on the web at iCloud.com. For additional security and to give you more control over your personal data, you can choose to turn off web access to your iCloud data so that your data is available only on your trusted devices.
When web access is turned off, your iCloud data that’s usually available on the web at iCloud.com — such as mail, contacts, calendar, photos, notes, reminders, files, and documents — can’t be accessed by you or anyone else.
If you turn on Advanced Data Protection for iCloud, web access via iCloud.com is automatically turned off. However, you can choose to turn web access back on and use your trusted devices to allow temporary access to your data.
On Mac
- Choose Apple menu > System Settings.
- Click your name, then click iCloud.
- Click to turn off or turn on Access iCloud Data on the Web.
When you turn off Access iCloud Data on the Web and then sign in to iCloud.com, you see an alert confirming that iCloud Data Web Access is Off and you can’t access your data. To turn web access back on, you can also select the “Manage access on device” link that appears on iCloud.com and follow the prompts on one of your trusted devices."
More information can be found in this article: Manage web access to your iCloud data
Let us know if you have any questions.
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Take care!