Profile on Lightroom to 400 files at the same time

[Shepherdphotographer]

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Hello everyone, I'm bothering you to ask you to solve my problem, related to Lightroom.  I wanted to apply my profile to all 400 photos in my catalog at the same time, all in DNG format: I selected them all in the Library, then I opened "Development" and applied my profile, present in the left column;  all the photos were selected, but only one photo appears in the Profile area;  then I clicked on the right mouse button and clicked on Export;  I chose tiff as format and clicked on export: at the top left I received the notification that Lightroom was exporting 400 photos.  Shortly after, opening some photos already converted to tiff with Photoshop, I realized that only the first one had been converted by applying the profile, while the others had remained unchanged, they were only in tiff format, without the profile applied.  I tried with jpeg, dng and original, instead of tiff, as output format, but still got the same result.  I tried with 3 photos, instead of 400: same result;  tried different catalogs, same result;  i tried with.  different hard drives, same result.  Computer with Intel i7 processor, with 32GB of RAM, so I don't think it's a power problem.  Help me once again, please!!  Thank you in advance!!

[Shepherdphotographer]

Found, thanks! (synchronization).

[adan]

Yeah, that last step can be sneaky.