En(de)crypt SD card missing - Xperia Z1 Compact Q&A, Help & Troubleshooting

Cannot find an option to encrypt SD card.
Only option I've found is Encrypt phone. If it means that SD card would be encrypted as well, why Decrypt SD card option is missing then?
AICP 12.1

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Unable to Encrypt SD Card?

I have a SGH-T999 with Android 4.0.4 which I'm trying to encrypt the SD card of under Settings->Security->Encrypt SD Card.
Under Encryption settings I can select any combination of settings and choose continue after which I am prompted to confirm my password.
However next I get a screen similar to the following:
---
Disable SD card encryption?
ø Device will not encrypt new files on SD card
ø Device will decrypt encrypted SD card
ø Decryption may take along time depending on the amount of data. It is recommended that you plug device into charger
ø All open files on SD card will be closed
ø During this process, SD card will not be available
[ Apply ]
--
Any ideas what's going on? I was able to encrypt the device without issue...

How good is the SD Card encryption feature that comes with the phone?

Under Settings > General > Security
I have some questions regarding the encryption
If I encrypt my SD card:
Will new files I transfer from my phone storage to the SD card be encrypted automatically? Or will I have to re-encrypt the entire SD card
How do I de-encrypt the SD card? Can it only be done with the specific phone that I used to encrypt it? Meaning if I encrypt my sd card, and my phone breaks in the futute, I'll never be able to de-encrypt it?
Can I access files on the encrypted card using a file explorer? If so, do I have to enter a password every time I want to look at a file?
That is all. Thanks you in advance.

Encrypted SD Card, quick Q&A.

I just got a 128GB SD card and I decided that it is a good idea if I encrypt the SD card, since the device is already encrypted. I didn't encrypt my last card, just for the record.
Anyway, I'm familiar with how Android Encryption works, I know the risk, I backup my phone regularly, and I know that putting the SD card DIRECTLY into another device or PC is not an option, anymore. Only my G4 can read/write to the SD card while it's encrypted.
Problem is this, I ASSUMED that so long as the SD card is in the phone and the phone is plugged into my PC, I could make file transfers between the SD card and the PC (the phone would handle the encryption process). No such luck. I have no way to transfer files between SD card and PC, unless I decrypt manually.
Any suggestions?
I just can across this same issue last week and have been hunting for an answer with no luck. Have you found any?
I though i could move files around internally and the OS would handle decrypting the files as they went from the SD card to the internal storage. I was a bad assumption. I want to encrypt the SD Card, but I cant move files onto or off of it.

SD card issue

Hi,
I tried to oem unlock my a2 lite without knowing that it wipes your data. Previously i have set up my sd card as my internal storage and now the problem is everything is in my SD card and i cant seem to access it. I tried to use a card reader and it doesnt work. Because the card is "raw" format. Any idea on how to retrieve the data inside my sd card or is it dead already? Thanks.

What happens to the encryption key on forget sd card?

Hi guys,
Recently my sd card, formatted as internal storage, got inaccessible for the phone for some reason.
If "forget sd card" option was selected, does it wipe out the sd card encryption key from /data/misc/vold?
Does it make sense to root the phone and try to extract the key?

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