attachment details disappear when preview and back

[tomholub]

Same device as the linked issue.

Reproduce:

1. go to Contacts app on Android, "manage", "export all". It produces a vcf file, like contacts.vcf
2. use FlowCrypt for Android to send it to yourself encrypted
3. open on iOS and notice the attachment on the bottom
4. the contents of the file render as text in the "view attachment" screen
5. tap the back icon on top left
6. message shows but it's now missing attachment details

Originally posted by @tomholub in #1707 (comment)

[tomholub]

[sosnovsky]

I can't reproduce this issue either.
@sosnovsky Could you check if it happens in your side?

Yes, I'll try to reproduce it on my device. Maybe it depends on file name (so only long names disappear)?

[sosnovsky]

@ioanmo226 I wasn't able to reproduce this bug, but maybe it happens because of this line https://github.com/FlowCrypt/flowcrypt-ios/blob/master/Core/source/mobile-interface/endpoints.ts#L269, so Core fails to decrypt file name and UI shows empty string.

[sosnovsky]

But I wonder why it only happens after user goes back to screen.

App shows encrypted file name when user opens thread details screen for the first time.
Then user taps on attachment, app decrypts it and shows attachment details screen.
When user goes back app shows decrypted file name (which is empty), that's why attachment name is visible only before decryption.