and all my tiles are gone, help
Do you mean, the titles are gone?
Photos will show the titles of a photo in the Info panel. You can also enable this option in the "View "menu: View > Metadata > Titles".
Then the titles of the photos will show below the thumbnails in the browser.
However, Photos handles filenames different from iPhoto. In iPhoto you would see the filename as a default title, if you did not assign a custom title. Photos does not use the filename as a default title. To use the filename as a title, you have to copy it from the Info panel (the second line with the filename) to the title line of the Info panel, the first line.