Mobile phone storage

According to THIS i am able to use the extra SD card to store apps:

   Once a card has been formatted as internal storage,  both your device internal storage and the card will show up as “device storage” under storage settings, and you will be able to  move applications which were in internal storage to the card. Moving applications to the card can be done from application settings (Settings > Apps > select application > Change storage location)
Once a card has been formatted as internal storage, Play Store will install applications on either storage volume automatically, based on a set of rules provided by the application developer (you will be able to move applications from one volume to another)

The card i added has been configured for internal storage. When i look at the storage settings, it's showing zero apps using the card. All the apps are in the phone's storage and none seems movable to the card. What gives?
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CEHJAsked:
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Kyle SantosQuality AssuranceCommented:
based on a set of rules provided by the application developer (you will be able to move applications from one volume to another)
Sounds like you're stuck with this and Google doesn't support it.  A recommendation would be to move your media to the SD card instead of moving apps there.  Or follow the recommendations by the author from that android central link.
Sources:
https://www.experts-exchange.com/questions/29058904/Cannot-move-apps-to-SD-card-on-Galaxy-Tab.html
https://forums.androidcentral.com/samsung-galaxy-note-3/364626-cant-save-move-apps-sd-card.html
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CEHJAuthor Commented:
Thanks Kyle. It's not inconceivable that the medium has got corrupted. I got a kernel error when i put the micro SD into my laptop. I'm just checking it for bad blocks now.
Of course, some (or all) apps might not move for quite different reasons.
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Jackie ManIT ManagerCommented:
Formatting microSD card as internal storage is not a good idea in long run.

Why?

microSD is not reliable if you want to run some apps which has frequent read/write. If you do, it is very likely a data loss will occur.

Besides, whenever an app get updated, it will move back to internal storage automatically and it will be very time consuming to manage your storage.

The proper way is to get a new smartphone with bigger internal storage.
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CEHJAuthor Commented:
Indeed. It's possible that the phone has had some difficulty with the card and has more or less fallen over as a result. afaicr it complained about the card speed at the outset, but i'm pretty sure i bought a class 10 one
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