Flameshot "Latest Uploads" does not show last screenshots

**Flameshot version**
v0.10.1 Qt 5.12.8 (deb version from github)

**Describe the bug**
After screenshoting and successfully saving, a history page "Latest Uploads" does not show anything.
Don't sure it should. But it would be good. See use case below.

**To Reproduce**
1. Take screenshot.
2. Save it locally.
3. Click Flameshot icon
4. Click "Latest Uploads"
5. The "Latest Uploads" window will open
6. The "Latest Uploads" is empty

**Expected behavior**
"Latest Uploads" show all latest screenshots. Not sure it by design.
But it would be good access to the latest screenshots and i.e. ability open folder and point to saved screenshot.

**Use case** is next:
1. Take screenshot
2. Edit, save locally
3. Go to "Latest screenshots" and select file
3. Click "Open containing folder" to point the screenshot file in file explorer
4. Drag'n'drop to browser or app (GitHub, Mail app, etc)

Maybe It should not bug, but feature-request.

**System Information**
Ubuntu 20.04.3 LTS (Gnome 3.36.8, x11 mode)

PS: Wildly love Flameshot app! Thanks! 🚀

Start by reproducing the save-locally workflow and opening the “Latest Uploads” entry from the Flameshot icon. Trace the entry point that populates that window; done means recent locally saved screenshots appear there and can be selected for opening their containing folder.

Written by the indexing model from the issue text.