How to transfer pictures from Picasa to Google Photos

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Hi,

I have tons of photos on Picasa dating from 2005, but only one web album listed. Since learning about Google Photos I have tried to upload some new photos to Google Photos through Picasa, but when I go to Google Photos by clicking the "view on line" option tab Google Photos tells me that there are no photos. Do all of my Picasa photos have to be in albums in order to up load to Google Photos? How can I upload ALL of my Picasa pictures to Google Photos.

Any idea?

Please help.

Thanks!

I didn't find the right solution from the Internet.

References productforums.google.com/forum/#!topic/photos/ryURd1MNJI0

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