Add instruction how to upload files

docs/api/types/input_file.md

@@ -14,5 +14,5 @@ This object represents the contents of a file to be uploaded. Must be posted usi
 - `from aiogram.api.types.input_file import InputFile`
 
 ## Related pages:
-
 - [Official documentation](https://core.telegram.org/bots/api#inputfile)
+- [How to upload file?](../sending_files.md)

docs/api/types/input_media_animation.md

@@ -30,3 +30,4 @@ Represents an animation file (GIF or H.264/MPEG-4 AVC video without sound) to be
 
 - [Official documentation](https://core.telegram.org/bots/api#inputmediaanimation)
 - [aiogram.types.InputFile](../types/input_file.md)
+- [How to upload file?](../sending_files.md)

docs/api/types/input_media_audio.md

@@ -30,3 +30,4 @@ Represents an audio file to be treated as music to be sent.
 
 - [Official documentation](https://core.telegram.org/bots/api#inputmediaaudio)
 - [aiogram.types.InputFile](../types/input_file.md)
+- [How to upload file?](../sending_files.md)

docs/api/types/input_media_document.md

@@ -27,3 +27,4 @@ Represents a general file to be sent.
 
 - [Official documentation](https://core.telegram.org/bots/api#inputmediadocument)
 - [aiogram.types.InputFile](../types/input_file.md)
+- [How to upload file?](../sending_files.md)

docs/api/types/input_media_photo.md

@@ -26,3 +26,4 @@ Represents a photo to be sent.
 
 - [Official documentation](https://core.telegram.org/bots/api#inputmediaphoto)
 - [aiogram.types.InputFile](../types/input_file.md)
+- [How to upload file?](../sending_files.md)

docs/api/types/input_media_video.md

@@ -31,3 +31,4 @@ Represents a video to be sent.
 
 - [Official documentation](https://core.telegram.org/bots/api#inputmediavideo)
 - [aiogram.types.InputFile](../types/input_file.md)
+- [How to upload file?](../sending_files.md)