I know everyone wants free apps, but in this case you have to be willing to buy one for around $6. but you pay once and you can put it on both your phone and Pad. It is one of the first and best iOS apps I have, and in the past year they added Chromecast casting, and it works great.
The app is called File Browser and made by this company: http://www.stratospherix.com/ Check it out. You likely need the regular personal version.
In fact, just this week I moved my photos and videos to my sort of new My Cloud large NAS, and used FB to view them. No problems, except I have a gen1 Chromecast, so when some videos stalled and stuttered (because the gen 1 only uses 2,4G wireless,) I got right on the internet and ordered the NEW Chromecast of this fall directly from Google Store that uses the faster 5G signal. It should arrive any day now. I actually hated my old Chromecast because it was not a 5G device and quite a few video streams were not well presented. I ALWAYS use 5G to stream between my network and mobile devices, and the old Chromecast was a weak link in the chain. It won’t be anymore.
Hope you enjoy FB as much as I do. Great for streaming movies on iPad and phone, And, one last comment:
WE WOULD NOT EVEN NEED THIS APP IF WD INCORPORATED THE CHROMECAST CAPABILITY INTO THEIR MY CLOUD APP AS SEAGATE DID IN THEIR SIMILAR APP A YEAR AGO! Hello WD, did you hear me this time? I challenge you again to make My Cloud app as good or better than Seagate’s.