Unable to upload sticker pack

[Herohtar]

• [x] I have searched open and closed issues for duplicates

• [x] I am using Signal-Desktop as provided by the Signal team, not a 3rd-party package.

Bug Description

After clicking the "Upload" button in the sticker pack creator, it fails with an error message (see screenshot). There are two closed issues that were reporting the same error message in older versions: #4217 and #5558

Steps to Reproduce

1. Open the sticker pack creator
2. Add images/assign emoji/fill out name/etc
3. Click "Next" on the final page, then "Upload"

Actual Result:

Upload fails with error message:

Error uploading stickers: cannot read property 'encryptAttachment' of undefined

Expected Result:

Sticker pack uploads successfully.

Screenshots

Platform Info

Signal Version: 5.19.0

Operating System: Windows 10

Linked Device Version: Signal Android 5.24.7.1

Link to Debug Log

https://debuglogs.org/23742c2d72b84b64c2b573f287ff5b4835a019efb66f602e34c7157b32abb4bb.gz

[TiMESPLiNTER]

Can confirm it for macOS as well.

Platform Info

Signal Version: 5.19.0

Operating System: macOS 11.5.2

Linked Device Version: Signal iOS 5.21.3.5

I do face this issue on version 5.19.0 for macOS downloaded from the official Signal website.

[Grobby4G]

Same problem here. Both on windows and on Debian version xenial/main amd64 signal-desktop amd64 5.19.0

Signal version 5.24.14 android 8 on SM-G930F

[nkummert]

I can also repro this issue on Signal 5.19.0 on Windows 11 and MacOS 10.14

[dnandha]

Same problem with 5.19.0-1 on on Arch Linux 5.14.6-arch1-1

[EvanHahn-Signal]

We fixed this in 4fefd3ccafb5c057381a33e5a3a12843d84e5555. It's already fixed in the latest beta and will be fixed in the next production version soon, so I'm going to close this issue.