How To Copy Paste Frames In Photoshop?

On the timeline, right top corner click on that bars --> then click on "Select all frames". This will do the selection of all frames. Now again click on the timeline right top corner click on that bars --> then click on "Copy frames", this will copy all your frames!

Now go to the tab where you want to paste them. Now click on timeline right top corner click on that bars --> then click on "Paste frames", this will paste all GIF frames in that Image timeline!

Now one setting panel will open make sure you select "Paste over Selection" and tick "Link Added Layer", and click "OK". this setting will merge all frames so you change any frame it will reflect in other as well.

Hope this helps you if you have any query please do comment below:)