Hi @Kiriaki Kokona ,
According to my understanding, you should store all the attachments of all items in a list into a SharePoint folder, right?
If so, you can do it by using flow.
Click Integrate-->Power Automate-->See your flows above the list to enter Power Automate.
Click Create and select Instant cloud flow.
Add a new step: Get all the attachments
For each attachment, download the file content.
Create a new file in your destination Folder.
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