Save artwork to jpg instead of png to reduce size.

Application/PlaybackEventController.m

@@ -177,26 +177,31 @@ didReceiveNotificationResponse:(UNNotificationResponse *)response
                     if ([defaults boolForKey:@"notifications.show-album-art"] && [pe albumArtInternal]) {
                         NSError *error = nil;
                         NSFileManager *fileManager = [NSFileManager defaultManager];
-                        NSString *tmpSubFolderName = [NSProcessInfo.processInfo globallyUniqueString];
                         NSURL *tmpSubFolderURL = [[NSURL fileURLWithPath:NSTemporaryDirectory()]
-                                URLByAppendingPathComponent:tmpSubFolderName isDirectory:true];
+                                URLByAppendingPathComponent:@"cog-artworks-cache" isDirectory:true];
                         if ([fileManager createDirectoryAtPath:[tmpSubFolderURL path]
                                    withIntermediateDirectories:true
                                                     attributes:nil
                                                          error:&error]) {
-                            NSURL *fileURL = [tmpSubFolderURL URLByAppendingPathComponent:@"art.png"];
+                            NSString *tmpFileName = [[NSProcessInfo.processInfo globallyUniqueString] stringByAppendingString:@".jpg"];
+                            NSURL *fileURL = [tmpSubFolderURL URLByAppendingPathComponent:tmpFileName];
                             NSImage *image = [pe albumArt];
                             CGImageRef cgRef = [image CGImageForProposedRect:NULL context:nil hints:nil];
                             NSBitmapImageRep *newRep = [[NSBitmapImageRep alloc] initWithCGImage:cgRef];
-                            [newRep setSize:[image size]];
-                            NSData *pngData = [newRep representationUsingType:NSBitmapImageFileTypePNG properties:@{}];
-                            [pngData writeToURL:fileURL atomically:YES];
+                            NSData *jpgData = [newRep representationUsingType:NSBitmapImageFileTypeJPEG
+                                                                   properties:@{NSImageCompressionFactor: @0.5f}];
+                            [jpgData writeToURL:fileURL atomically:YES];
 
                             UNNotificationAttachment *icon = [UNNotificationAttachment attachmentWithIdentifier:@"art"
                                                                                                             URL:fileURL
                                                                                                         options:nil
                                                                                                           error:&error];
-                            content.attachments = @[icon];
+                            if (error) {
+                                // We have size limit of 10MB per image attachment.
+                                NSLog(@"%@", error.localizedDescription);
+                            } else {
+                                content.attachments = @[icon];
+                            }
                         }
                     }