Do you mean that you see your saves from Episode 1 to 8 if you launch BaD Ep8 on your Android device, but if you launch a newer vesion of BaD you don't see them?It doesn't show up. I've used Brandy Android Port. I see the saves on my device, it just doesn't show up on this newer version.
If so, it's normal. Season1&2 (from Ep1 to Ep8) is a game. Season 3 (currently composed by: Interlude, Episode 9, Episode 10) is another game. They save in different folders.
On PC, after the last screen of Episode 8 (which is also the end of Season 2) you are asked to save your game in a special save page:
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Such a page saves a maximum of 20 saves into the multipersistent file:
C:\Users\<YourUsername>\AppData\Roaming\RenPy\persistent\BeingADIKSeason2Transfer1366998845so that the launcher of Season 3 can retrieve them and show them to you under the "Import" entry in main menu. (While regular saves are loaded by clicking on the "Continue" entry in main menu.)
I don't think that such a behaviour is replicable in Android, because If Season2 and Season3 are different Apps I don't think Android allows one to see the files of the other (N.B. I'm no expert, I could be wrong).
So I think under Android you have to do some manual work to manually access the user accessible folder where BaD Season 3 saves its regular saves and paste there the save file from which you desire to start (for example the last of your regular saves of Season 2 or one of the saves provided at page 1 of this thread).
Anyway, I've never used any BaD Android port, so I'm not 100% sure of that.