MessagesSendMultiMedia returns rpc error code 400: MEDIA_INVALID when sending multiple media in a single post

[asadbekGo]

I am trying to send multiple media files (e.g., images) in a single post using MessagesSendMultiMedia, but I keep getting the error:
rpc error code 400: MEDIA_INVALID

_, err = v1.tgBot.Client.API().MessagesSendMultiMedia(context.Background(), &tg.MessagesSendMultiMediaRequest{
Peer: &tg.InputPeerChat{ChatID: groupId},
MultiMedia: []tg.InputSingleMedia{
{
Media: &tg.InputMediaUploadedPhoto{File: inputFile},
RandomID: rand.Int63(),
Message: post.Text,
},
{
Media: &tg.InputMediaUploadedPhoto{File: inputFile},
RandomID: rand.Int63(),
},
},
})

What I Tried:

1. Verified that inputFile is correctly uploaded and contains valid ID, Parts, and MD5Checksum.
2. Ensured &inputFile is correctly assigned (also tried inputFile without pointer).
3. Tried InputMediaUploadedDocument instead of InputMediaUploadedPhoto (same error).
4. Attempted adding Flags: 1, but GroupedID is not available in InputSingleMedia.
   Questions:
5. How can I send multiple media files in a single post instead of separate messages?
6. Is there a way to properly group media items using MessagesSendMultiMedia?
7. Does InputSingleMedia support GroupedID, or is there another approach?
   Would appreciate any insights or suggestions. Thanks!

[asadbekGo]

@ernado

[borzovplus]

before using MessagesSendMultiMedia you should upload all files to telegram, please check docs before creating a issue https://core.telegram.org/methods

[asadbekGo]

@borzovplus I checked this and studied the documentation, but I still face the same problem. Have you tried using multiMedia yourself, if you know, can you please show me?

[borzovplus]

I can not to show, because I have a lot of abstractions (to much codes).
Try use "github.com/gotd/td/telegram/uploader" to upload Media before call MessagesSendMultiMedia, than create []tg.InputSingleMedia with uploaded medias

[asadbekGo]

func UploadFile(ctx context.Context, client *telegram.Client, filePath string) (tg.InputFileClass, []byte, error) {
file, err := os.Open(filePath)
if err != nil {
return nil, nil, fmt.Errorf("error opening file: %w", err)
}
defer file.Close()

fileInfo, err := file.Stat()
if err != nil {
	return nil, nil, fmt.Errorf("error getting file info: %w", err)
}

if fileInfo.Size() > maxFileSize {
	return nil, nil, fmt.Errorf("file size exceeds the limit of %d bytes", maxFileSize)
}

fileBytes, err := io.ReadAll(file)
if err != nil {
	return nil, nil, fmt.Errorf("error reading file: %w", err)
}

upl := uploader.NewUploader(client.API()).WithPartSize(uploader.MaximumPartSize)

f, err := upl.FromPath(context.Background(), filePath)
if err != nil {
	return nil, nil, fmt.Errorf("error creating uploader from path: %w", err)
}

return f, fileBytes, nil

}

@borzovplus Yes, I am using the same uploader package, but still no result.

[shampigeon]

Have you found a solution? @asadbekGo

[asadbekGo]

no, I still haven't found a solution. If you know a solution, please help @shampigeon

[asadbekGo]

please help @ernado