[Help] (Files size problem) I really need a hand for my last step, thank you

I just create a 360 VR video app by Easy movie texture asset, but now facing a problem which is my files size too large, I put my video in SteamingAssets folder atm, but when I build up my app in Andriod platform its just show

"android asset packaging tool failed" I just found it because the file size that in SteamingAssets is too Large.

and now I want to put the video into my phone first (Internal Storge) and use some Code to call the video,

I just have an idea I should use Load () function to call it, but I really don't know "Where" and "How" should I put it in, anyone can give me a hand? I stuck on it for a while, Many Thanks!

Have a good day!