keyframes of my project have disappeared when I´ve updated to a recent version

Hello:
I´ve edited a project a few years ago (10.0.6) I want to work on it in the 10.3 version, previously I´ve tried to open it in 10.2.3 but all the animations that I did not have been remained. ¿Is there any reason for it?.
Thanks

What specifically did you keyframe? did it involve third party plugins?

Just Images.

"Images" doesn't answer the question, but...
That's a huge jump from one version to the other, so there's no telling what the cause would be. All your content is there, all your edits, everything except the keyframes? There's no other issues?

Sorry, Position and Scale Keyframes on still images. All the content remains in the project except the keyframes. Thanks

That is a huge jump, and you'd think simple keyframes like that would have translated. If you used the Ken Burns effect, I could see losing stuff. Not sure, maybe someone else has an answer. But, all Ic an say is, that huge of a jump is risky.

Thanks!!