@Samuel Santos,Thanks for posting in Q&A.
From your description, I know that you want to leave a note on the desktop of all enrolled devices.
Based on my testing, you can create a file with content via PowerShell and deploy the PowerShell script via Intune.
Here are the contents of script.
New-Item -Path "C:\Test" -Name "testfile1.txt" -ItemType "file" -Value "This is a text string."
- Path means where the file locates.
- Name means the file name.
- Value means the content of the file.
You can follow the steps below to upload the script and deploy it via Intune.
1.Create a .ps1 file and enter the content of script above.
2.Go to Intune admin center > Devices > Script > Add Windows 10 and later >Upload .ps1 file and configure settings > Assign groups.
Then the script will work.
Please try above information. If there is any update, feel free to contact me.
If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.