If you are using the Chrome browser and you accidentally have stopped Yahoo from downloading files (when closing a pop-up asking for permission to download multiple files). You can check to see if this is the case for you easily. Open the Chrome Settings > Privacy > Content Settings > Automatic Downloads. Allow automatic downloads and see if that fixes your issues the next time you attempt to download a PDF or other file from the Yahoo Mail. Call on Yahoo UK to get connected with the experts in case if you are facing any issue.
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