Improve logging for file download process

telegram/utils.go

@@ -356,6 +356,7 @@ func (c *Client) formatForward(fwd *client.MessageForwardInfo) string {
 }
 
 func (c *Client) formatFile(file *client.File, compact bool) string {
+	log.Debugf("file: %#v", file)
 	if file == nil || file.Local == nil || file.Remote == nil {
 		return ""
 	}
@@ -367,6 +368,7 @@ func (c *Client) formatFile(file *client.File, compact bool) string {
 		src = file.Local.Path // source path
 		_, err := os.Stat(src)
 		if err != nil {
+			log.Errorf("Cannot access source file: %v", err)
 			return ""
 		}