Put it back the way it was before the recent change in how uploads are done.
Recently, adding photos in the oldest available version results in the message “Compose Failed The message you are trying to open is no longer available. Back to Inbox [link]”. When I click on the link, two new messages are in the inbox, one with the attachment! The other without the attachment. To add another attachment, I must open the one with the attachment and select Forward, then add the attachment. This combination of actions must be repeated for every attachment I want to add. 5 attachments, 5 forwards and duplicates. It’s a mess. Please put it back the way it used to be so that I can attach repeatedly one at a time (my internet supplier is too slow to do more than one at a time, or it never completes). I’m not interested in upgrading to the standard version of Yahoo! Mail. I only use that to block spam senders. Please put the earlier version back to the way it was before this uploading mess started. Thank you.

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William Boylan commented
Why did they change Yahoo mail? The "basic" version is terrible, and the "standard" version is worse, just primitive! Who would want that? They should go back to the way it was a few months ago.
And then there are the "guidelines"; "Please search and vote before posting!" Search where???
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Appookta Simon commented
Recently, adding photos in the oldest available version results in the message “Compose Failed The message you are trying to open is no longer available. Back to Inbox [link]”. When I click on the link, two new messages are in the inbox, one with the attachment! The other without the attachment. To add another attachment, I must open the one with the attachment and select Forward, then add the attachment. This combination of actions must be repeated for every attachment I want to add. 5 attachments, 5 forwards and duplicates. It’s a mess. Please put it back the way it used to be so that I can attach repeatedly one at a time (my internet supplier is too slow to do more than one at a time, or it never completes). I’m not interested in upgrading to the standard version of Yahoo! Mail. I only use that to block spam senders. Please put the earlier version back to the way it was before this uploading mess started. Thank you.