Plugin file-upload.php doesn't work on a nullable field
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After you had choosen the file to be uploaded, the function-field still remain as "NULL" and this is preventing the file of being uploaded . So, you must remember to manually remove this "NULL" on the left-drop-down, every time you need to upload a new file.
The workaround was set the "*_path" field as NOT NULL with a dummy default value like "empty", "void", etc
The the most likely cause is, different from the "native-generated-fields", this "plugin-generated-field" doesn't have any javascript that removes the NULL from the function-drop-down after the file had been choosen.
Fixed since Adminer 4.4.0.