Hiking among Plum Blossoms

I would capitalize “among” here, but this is a matter of style.

This time itI included myan English narration / I narrated it in English.

I agree with cptyossarian‘s comments, but I’m also uncomfortable with “includes/included my English narration,” because this makes it sound like an English narration existed last time, but you chose not to include it. Instead, I would make you the subject of the sentence, change “my” to “and,” and even change “narration” into to a verb.

Hiking aAmong Plum Blossoms

Usually, you capitalize words that aren't prepositions (e.g., for, under) for titles in English.

This time it, I included my English narration.

After all, practicing English is my main goal here, hahaha~. 😅

I'm going for a slightly more formal English. There are people who end their sentences with hahahaha but lots of Gen Z use this emoji: 💀 to show they're laughing. I usually use these emojis: 🤣, 😂, or 😅, depending on how funny I think I'm coming off.

Hiking aAmong Plum Blossoms

Knit-picky detail. Even though we typically do not capitalize words like "the" or "and" in titles, if the preposition is over 5 letters we capitalize it! I do not full know the reason behind this though...

Two days ago, I uploaded a video of the plum blossoms from my last hike, which just that only included the flowers.

Now yYou can see the journey of the hike here: https://www.youtube.com/shorts/z65yqLErCl0.

I would remove the "now" since, otherwise, there's an implication that this wasn't set up before. Like, "oh, whoops, I forgot to upload the video... There! *Now* you can see..."

Or, you could add a "right" to say, "Right now, you can see..."

Hiking among Plum Blossoms

I searched online, and it seems to be a matter of opinion whether "among" should be capitalised in titles, but to me it looks strange uncapitalised, since it's a longer word. The rule that seems the best to me is to capitalise any word that is 4 or more letters.

This time it includeds my English narration.

You should use present tense here because you're telling us what the video is like (notice: "is", present tense). If you use past tense, it sounds like the video changed, like it had narration in the past but doesn't now.

Also, this sentence is grammatically correct and not unnatural, but a bit more natural way to say it could be something like, "This time I included a narration I did in English." I wrote 'included' and not 'includes' because you made the narration in the past!