Issue Summary

Sharing a file from another app to an existing card in the Android Trello mobile app causes a UI glitch, which prevents a user from scrolling through an entire list in order to select a card to share the file to.

Steps to Reproduce

1. Have Trello installed on Android
2. Open another app (I tested with Slack)
3. Select a file within that secon app, then choose to share it to Trello using the iOS share option. In Slack, the menu item Share to another app prompts the iOS share modal
4.  Select Trello, then Add to existing card
5. Select a destination board and list

After a list is selected, a list of cards is shown below.

Expected Results

Expected: A user can scroll through and select any card from the chosen list

Actual Results

Actual: The cards in the list disappear and reappear. Each time they flicker the screen scrolls back to its top position, making it impossible to select cards beyond the bottom of the screen.

Workaround

Download the file and attach it through the attachment modal within the destination card rather than sharing it from a secondary app.