I have a SharePoint Document Library containing about 1500 pictures and about 15 columns of metadata created years ago, and I have a new requirement that requires the functionality of a Picture Library. Is there a way to migrate the 1500 pictures and their metadata to a Picture Library? Is manual data entry the only way to accomplish this? I hope not. Thanks in advance for your help!
It turns out that the answer to my question was answered by Eric. Data can be moved from one library to another simply by using Content and Structure in Site Settings.
NOTE: The error I mentioned in my comments is still occurring, but only on my Office 365 site. I will research that as a separate issue.
NOTE: The "SharePoint Server Publishing" feature needs to be turned on before the Content and Structure settings are available.