Allow deleting of files whose corresponding message is not currently loaded in the client

packages/rocketchat-ui-flextab/flex-tab/tabs/uploadedFilesList.coffee

@@ -24,9 +24,7 @@ Template.uploadedFilesList.helpers
 		return s.escapeHTML @name
 
 	canDelete: ->
-		msg = ChatMessage.findOne { file: { _id: @_id } }
-		if msg
-			return RocketChat.authz.hasAtLeastOnePermission('delete-message', msg.rid) or RocketChat.settings.get('Message_AllowDeleting') and msg.u?._id is Meteor.userId()
+		return RocketChat.authz.hasAtLeastOnePermission('delete-message', @rid) or RocketChat.settings.get('Message_AllowDeleting') and @userId is Meteor.userId()
 
 Template.uploadedFilesList.events
 	'click .room-file-item': (e, t) ->
@@ -53,9 +51,15 @@ Template.uploadedFilesList.events
 				timer: 1000
 				showConfirmButton: false
 
+				# Check if the upload message for this file is currently loaded
 				msg = ChatMessage.findOne { file: { _id: self._id } }
 				RocketChat.models.Uploads.remove self._id, () ->
-					chatMessages[Session.get('openedRoom')].deleteMsg(msg);
+					if msg
+						chatMessages[Session.get('openedRoom')].deleteMsg(msg);
+					else
+						Meteor.call 'deleteFileMessage', self._id, (error, result) ->
+							if error
+								return Errors.throw error.reason
 
 	'scroll .content': _.throttle (e, t) ->
 		if e.target.scrollTop >= e.target.scrollHeight - e.target.clientHeight

server/methods/deleteMessage.coffee

@@ -38,4 +38,8 @@ Meteor.methods
 		if showDeletedStatus
 			RocketChat.models.Messages.setAsDeletedById originalMessage._id
 		else
-			RocketChat.Notifications.notifyRoom originalMessage.rid, 'deleteMessage', { _id: originalMessage._id }
+			RocketChat.Notifications.notifyRoom originalMessage.rid, 'deleteMessage', {_id: originalMessage._id}
+
+	,
+	deleteFileMessage: (fileID) ->
+		Meteor.call 'deleteMessage', RocketChat.models.Messages.findOne { file: { _id: fileID } }

server/publications/roomFiles.coffee

@@ -17,6 +17,7 @@ Meteor.publish 'roomFiles', (rid, limit = 50) ->
 			uploadedAt: -1
 		fields:
 			_id: 1
+			userId: 1
 			rid: 1
 			name: 1
 			type: 1