Restrict specific file type while uploading

[rmeyer]

Check this post for a Client Script restricting the allowed file types for an Attach field (tested on develop / v16):

Attach field type - Allowed file extensions

You can achieve this via the following Client Script: frappe.ui.form.on("MY DOCTYPE", { refresh: function (frm) { const attach_field = frm.fields_dict["MY FIELDNAME"]; attach_field.on_attach_click = function () { attach_field.set_upload_options(); attach_field.upload_options.restrictions.allowed_file_types = [ "application/xml", "text/xml", ]; attach_field.file_uploader = new frappe.ui.FileUploader(attach_field.upload_options); }; } }); Tested on develop / v16.