Last night I created a video about my fFuchsia, the second pot of my flowers, that I bought for the Chinese New Year.

"Fuchsia" should be capitalized as its a plant genus.

I removed the second "," and added "that I" to make it flow a little more naturally.

This morning, I thought that I couldidn't havquite captured the nimble feeling of the flowers, so I took a few more pictures.

When you say "I couldn't have captured" in this context, it sounds as though you our doubting your general ability to take pictures of the flowers. However, I think you meant that in your last video you "couldn't have captured" the nimble feeling well.

So I rephrased it to" "I thought that I didn't quite capture the nimble feeling" to more directly relate to your previous video and have less ambiguity.

As usual, if you find any mistakes in the video, please let me know.

Last night I created a video about my fuchsia, the second pot of my flowers, I bought for the Chinese New Year.

This morning, I thought that I couldn't possibly have captured the nimble feeling{elastic feeling | flexibility} of the flowers, so I took a few pictures.

“Nimble” implies movement. I assume you’re thinking of “灵活”? If so, in addition to “nimble,” my dictionary also gives “flexible, elastic” as another definition.

You are welcome to watch the video here: https://www.youtube.com/shorts/5xyqx5fldNU,

A sentence generally cannot contain two colons, so a comma isn’t necessary, since the next line is a separate sentence.

aAnd the pictures are here: https://www.youtube.com/post/UgkxN3Jzx02zX24fHduyI7c0Ic2yjgZ4Dz8R

Last night I created a video about my fuchsia, themy second pot of my flowers, which I bought for the Chinese New Year.

This morning, I thought that I couldn't have captured the nimble feeling of the flowers, so I took a few pictures.

I'm not sure "nimble" works well here - it's more to do with moving quickly or thinking quickly.
Some good words to describe flowers --> stunning, exquisite, delicate, beautiful

and see the pictures here: https://www.youtube.com/post/UgkxN3Jzx02zX24fHduyI7c0Ic2yjgZ4Dz8R

I changed this because you can't really say "watch pictures", you have to "look at" pictures or "see" pictures, and only "watch" videos. Since this continues on from your previous sentence, the watch is implied in front of the word pictures, the same way it is used in "watch the video".