Cannot view multiple sheets on iPad or iPhone

Hi,
I have a link to a LibreOffice calc app on my website. This app contains data on 3 seperate sheets. If I access it using any browser on a windows 10 PC or an Android device then all the sheet tabs are available. However if I try this on an iPhone or iPad the data on the first sheet displays fine but tabs for sheets 2 and 3 are not shown.
Any ideas or are the iOS devices a “no go” for multiple sheet applications.

Thanks Mike

Please add the precise name and who created the app. Check in your store.
.
IOS and Android are quite different from regular desktop OS, so I assume this is no TDF build, but has to be modified somewhere. The creator of the app will be the most likely point where you may get help…

I have solved the problem.
I should have added that the libreoffice calc app I created was stored in Dropbox. My website is a wordpress.com app. In the wordpress app there is a link to Dropbox. The problem was that Dropbox needs to be installed on the users phone/tablet.
Now with Dropbox installed on the client device my app works like a dream.

Thanks for your interest

Regards Mike