Even if $wgStrictFileExtensions = false, upload button on edit toolbar only allows images,
**Latest version reproduced:**
MediaWiki core 1.31.0-alpha [(52aeaa7)](https://gerrit.wikimedia.org/g/mediawiki/core/+/52aeaa7a5fb0c233caa9f7815882f7a99cf4ece3)
WikiEditor 0.5.1 [(8f6a390)](https://gerrit.wikimedia.org/g/mediawiki/extensions/WikiEditor/+/8f6a39059e52ed6a87b34343de3d176bcdc7c4db)
**Steps to reproduce:**
# In FTP, add following lines to LocalSettings.php and save
```
wfLoadExtension( 'WikiEditor' );
$wgStrictFileExtensions = false;
```
# Log into Wiki.
# Go to Special:Upload page.
# Confirm i can upload a .txt file.
# Enter source edit-mode on a page.
# Click "Embedded File" button in toolbar.
# Click "Upload" button in popup.
# Select a .txt file.
# Check on "This is my own work".
# Click "Upload".
# Enter description.
# Click "Save".
# Receive error
> Unknown warning: "{"upload":{"result":"Warning","warnings":{"**filetype-unwanted-type":["txt"**,"png, gif, jpg, jpeg, webp",5]},"filekey":"15m9ibdt6718.9j6h2t.1.txt","sessionkey":"15m9ibdt6718.9j6h2t.1.txt"}}"."