diff --git a/telethon/client/downloads.py b/telethon/client/downloads.py
index 06368428..d7ae5a9c 100644
--- a/telethon/client/downloads.py
+++ b/telethon/client/downloads.py
@@ -223,7 +223,8 @@ class DownloadMethods:
                 The output file path, directory, or stream-like object.
                 If the path exists and is a file, it will be overwritten.
                 If file is the type `bytes`, it will be downloaded in-memory
-                as a bytestring (e.g. ``file=bytes``).
+                and returned as a bytestring (i.e. ``file=bytes``, without
+                parentheses or quotes).
 
             download_big (`bool`, optional):
                 Whether to use the big version of the available photos.
@@ -333,7 +334,8 @@ class DownloadMethods:
                 The output file path, directory, or stream-like object.
                 If the path exists and is a file, it will be overwritten.
                 If file is the type `bytes`, it will be downloaded in-memory
-                as a bytestring (e.g. ``file=bytes``).
+                and returned as a bytestring (i.e. ``file=bytes``, without
+                parentheses or quotes).
 
             progress_callback (`callable`, optional):
                 A callback function accepting two parameters:
@@ -376,6 +378,9 @@ class DownloadMethods:
                 path = await message.download_media()
                 await message.download_media(filename)
 
+                # Downloading to memory
+                blob = await client.download_media(message, bytes)
+
                 # Printing download progress
                 def callback(current, total):
                     print('Downloaded', current, 'out of', total,
diff --git a/telethon_generator/data/errors.csv b/telethon_generator/data/errors.csv
index cd4517c4..374362bc 100644
--- a/telethon_generator/data/errors.csv
+++ b/telethon_generator/data/errors.csv
@@ -427,6 +427,7 @@ STICKER_FILE_INVALID,400,Sticker file invalid
 STICKER_GIF_DIMENSIONS,400,The specified video sticker has invalid dimensions
 STICKER_ID_INVALID,400,The provided sticker ID is invalid
 STICKER_INVALID,400,The provided sticker is invalid
+STICKER_MIME_INVALID,400,Make sure to pass a valid image file for the right InputFile parameter
 STICKER_PNG_DIMENSIONS,400,Sticker png dimensions invalid
 STICKER_PNG_NOPNG,400,Stickers must be a png file but the used image was not a png
 STICKER_TGS_NODOC,400,You must send the animated sticker as a document
diff --git a/telethon_generator/data/methods.csv b/telethon_generator/data/methods.csv
index 610e1d13..8c5d0284 100644
--- a/telethon_generator/data/methods.csv
+++ b/telethon_generator/data/methods.csv
@@ -332,7 +332,7 @@ phone.toggleGroupCallSettings,user,GROUPCALL_NOT_MODIFIED
 photos.deletePhotos,user,
 photos.getUserPhotos,both,MAX_ID_INVALID USER_ID_INVALID
 photos.updateProfilePhoto,user,PHOTO_ID_INVALID
-photos.uploadProfilePhoto,user,ALBUM_PHOTOS_TOO_MANY FILE_PARTS_INVALID IMAGE_PROCESS_FAILED PHOTO_CROP_SIZE_SMALL PHOTO_EXT_INVALID VIDEO_FILE_INVALID
+photos.uploadProfilePhoto,user,ALBUM_PHOTOS_TOO_MANY FILE_PARTS_INVALID IMAGE_PROCESS_FAILED PHOTO_CROP_SIZE_SMALL PHOTO_EXT_INVALID STICKER_MIME_INVALID VIDEO_FILE_INVALID
 ping,both,
 reqDHParams,both,
 reqPq,both,