Short film or Mini-series?

Hi! First post on here.

I'm currently in the process of writing a short film or potential mini-series which I'll then post on YouTube.

My issue is, I don't know whether to make it a short film or a mini-series.

I believe that generally it would work better as a short film of around 40 minutes, however as this will be posted on YouTube it is very rare people will have the attention span to watch the same thing for 40 minutes...which is making me lean towards a mini-series of 10 minute episodes.

If anyone has any suggestions or advice then that'd be great, thanks!

If it doesn't work as short film try a mini-series.
If it doesn't work as a mini-series try a bigger series?