Hi Kartik,
Restrictions may be present in system properties on permitted file type uploads. The main property 'glide.attachment.extensions' may contain in its Value field a list of file types. In this case only these file types are permitted to upload. If instead the value is empty, all file types are permitted as attachments. You can edit the value list to add or remove problematic file types.
If the above has been checked and the issue still persists, the issue is with MIME type checking. When an application searches for the MIME type of a file, it checks the filename against the MIME information files. If a match for the filename is found, the MIME type associated with the extension or pattern is the MIME type of the file. You can disable this security upload-stop feature by editing the system property 'glide.security.file.mime_type.validation' and setting its Value to 'false'.
Though you can always convert the image using some converter and then upload it. Obviously this would be a temporary solution.
