Uploading multiple attachments from canvas apps to SharePoint

1、 Prepare one canvas page The contents shall include the following 4 Parts of ：

 ①②

③

 2、 You need to prepare a flow

Each step is

base64ToBinary(items('Apply_to_each')['base64'])

 3、 Add canvas apps Front-end logic , And connect to flow

button Button   Logic code ：

ClearCollect(
    ColAllFiles,
    ShowColumns(
        AddColumns(
            Gallery3.AllItems,
            "base64",
            With(
                {
                    varAttachmentControl: JSON(
                        Image3.Image,
                        JSONFormat.IgnoreBinaryData
                    )
                },
                Mid(
                    varAttachmentControl,
                    Find(
                        ",",
                        varAttachmentControl
                    ) + 1,
                    Len(varAttachmentControl) - Find(
                        ",",
                        varAttachmentControl
                    ) - 1
                )
            )
        ),
        "base64",
        "Name"
    )
);
UploadMultipleFiles.Run(JSON(ColAllFiles,IndentFour));

 gallery Logic code ：

 4、 Effect display

 

Reference resources ： Use Flow stay Power Apps Upload multiple files to Sharepoint Document_Sucyyan The blog of -CSDN Blog