Basic rules and Monster Manual DnDB Mobile app hard to download

Basic rules and Monster Manual DnDB Mobile app hard to download.

I have downloaded my other purchased content including the Eberron Rise from Last War.

Now having problem on downloading these 2.

Each having 190mb+ in size of the content.

Its progress always stopped in the middle of download.

How to fix this? :/

Buy and install SD card to expand phone memory?

The app focus on putting the downloaded content on my phone memory which has 13gb free.

I'm using galaxy note 8, 64 gb

Hmm slow Wi-Fi or phone going to sleep and canceling the download?

Yes if im at work.

But at home having highspeed net, it stops and asked to be downloaded again 😡😡😡