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Unable to convert the binary data from attachment control to base64 string

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Posted on by hkay

Hi All,

I am kind of a newbie in PowerApps. I have tried a few solutions from the community but could not find a solution that would work. I have an attachment control where I want to be able to add multiple images at a time. I was able to get everything set up and the data is being saved in the backend SQL server properly. However, I have another column which is basically a base64 string of the same binary image. I tried this code but it is not showing up the entire base64 string. For some reason, it is only showing one line.

ClearCollect(varCollections, ForAll(AttachmentControl.Attachments, {
image: Value
, image_base64: Mid(JSON(Value, JSONFormat.IncludeBinaryData), 25, Len(JSON(Value, JSONFormat.IncludeBinaryData))-25)
,requester_email: User().Email}))

This is the front-end. I created a gallery which shows the binary and base64 along with the image. Gallery is connected to the attachment control. The second line is image_base64 but it is not showing the entire base64 string. Any idea?

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WarrenBelz 153,051 Most Valuable Professional on at

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Hi @hkay ,

Put in an Image Control (you can hide it) with the Image

Last(AttachmentControlName.Attachments).Value

then run the JSON on that.

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hkay 3 on at

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Hi @WarrenBelz ,
Thank you so much for the solution. It partially worked. I was able to save the images as base64 in the backend. The only problem is when I put this in the ForAll to save the data, it is only saving the last image from the image control in the backend. I am not sure how to go around this. Here is the updated query.
ClearCollect(varCollections, ForAll(AttachmentControl_1.Attachments, {image: Value ,image_base64: Mid(JSON(Image5.Image, JSONFormat.IncludeBinaryData),24,Len(JSON(Image5.Image, JSONFormat.IncludeBinaryData))-24) ,requester_email: User().Email}));

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WarrenBelz 153,051 Most Valuable Professional on at

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@hkay ,

You are correct, you cannot do this within a ForAll statement.

The hidden image is a workaround (the Attachment Control is designed to be attached to a list), but if you want to send them out to a Flow, they need to be one at a time as far as I am aware.

The only other thing possible with them all is to send as email attachments as that connector is compatible with the storage structure (but not suitable for what you are doing)

Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

MVP (Business Applications) Visit my blog Practical Power Apps

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MooFeR on at

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A simple fix is instead of doing ClearCollect on your button, to do a Collect on the attachment control's OnAddFile property. You can even use Reset(Self) at the end of OnAddFile since you don't need the file there as it's in your gallery now.

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