Downloading videos using any downloading app

[hhashimi]

I Have the problem with downloading videos on my iPhone 6 using downloading apps but using the same app on my iPhone 5 there is no problem I can download videos normally
how can I solve this issue

 

[kch50428]

Which apps?

 

[hhashimi]

Best video
Idownload
Free video
Vdownloader
Download
The work ok on my iPhone 5