ENGCOM-3937: #20376 Fix issue with file uploading if an upload field is disabled #20461

 - Merge Pull Request #20461 from serhiyzhovnir/magento2:issue-20376-fixed-2.3
 - Merged commits:
   1. dd9e8cf
   2. 85c4e92
   3. d91d0ed
   4. 3671bbe
   5. b0363af

Author: magento-engcom-team

app/code/Magento/Ui/i18n/en_US.csv

@@ -190,4 +190,5 @@ CSV,CSV
 "Please enter at least {0} characters.","Please enter at least {0} characters."
 "Please enter a value between {0} and {1} characters long.","Please enter a value between {0} and {1} characters long."
 "Please enter a value between {0} and {1}.","Please enter a value between {0} and {1}."
-"was not uploaded","was not uploaded"
+"was not uploaded","was not uploaded"
+"The file upload field is disabled.","The file upload field is disabled."

app/code/Magento/Ui/view/base/web/js/form/element/file-uploader.js

@@ -348,6 +348,12 @@ define([
                 allowed  = this.isFileAllowed(file),
                 target   = $(e.target);
 
+            if (this.disabled()) {
+                this.notifyError($t('The file upload field is disabled.'));
+
+                return;
+            }
+
             if (allowed.passed) {
                 target.on('fileuploadsend', function (event, postData) {
                     postData.data.append('param_name', this.paramName);