Power Apps attachment formula works by default but not when I try to add it into container

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Posted on by Appleonwindows

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hi everyone,

i am facing an issue in power app where my attachment display logic works when im using the classic "edit form" but not when i try to customise the form.

This is what I have in the default classic edit form vs the one i put it in container

	Form2	My customise form
DataSource	MAS56Attachments	MAS56Attachments
DefaultMode	FormMode.Edit	//If(IsBlank(varAttachmentRecord.ID)\|\|IsBlank(LookUp(MAS56Attachments,MAS56ID.ID=varMasterData.ID)),FormMode.New,FormMode.Edit) FormMode.Edit
Item	First( SortByColumns( Filter( MAS56Attachments, MAS56ID.ID = varMasterData.ID ), "modifiedon", SortOrder.Descending ) )	First( SortByColumns( Filter( MAS56Attachments, MAS56ID.ID = varMasterData.ID ), "modifiedon", SortOrder.Descending ) )

	Attachment_DataCard2	Attachment_DataCard3 (my customised form)
DataField	"cr437_attachment"	"cr437_attachment"
Default	If(!IsBlank(ThisItem.Attachment.FileName), Table({DisplayName: ThisItem.Attachment.FileName, Value: ThisItem.Attachment.Value}), Blank())	If(!IsBlank(ThisItem.Attachment.FileName), Table({DisplayName: ThisItem.Attachment.FileName, Value: ThisItem.Attachment.Value}), Blank())
Displayname	DataSourceInfo([@MAS56Attachments],DataSourceInfo.DisplayName,'cr437_attachment')	DataSourceInfo([@MAS56Attachments],DataSourceInfo.DisplayName,'cr437_attachment')

	Datacardvalue10	Datacardvalue12 (my customised form)
Default	Parent.Default	Attachment_DataCard3.Default

as u can see, the formula is the same but the result in the screenshot below is different

as the one at the bottom (my customised form) should show "Trip to New.." but it is not showing.

Please advise

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Building Power Apps

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11manish 2,647 on at

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The most likely cause is that the customized attachment control has lost its original form/DataCard binding context, causing ThisItem.Attachment or

Parent.Default to evaluate differently at runtime.

If the attachment control was manually recreated, the easiest and most reliable approach is often:

Delete the customized attachment card.

Re-add the attachment field from the form's field list.

Unlock the card only if necessary.

Apply styling and layout changes while keeping the original DataCard structure intact.

Attachment controls are one of the few Power Apps controls that are highly dependent on the form and DataCard hierarchy.

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Kalathiya 2,318 Super User 2026 Season 1 on at

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Hello @Appleonwindows,

Looks like you need to set the attachment control's Items property instead of the Default property. It seems the Items property is not configured correctly, that's why the existing attachments are not showing up.

Attachment control expects the existing attachments to be passed through the Items property.

Please pass the items in attachment control items property and check, it will work as expected.

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Valantis 6,025 on at

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Hi @Appleonwindows,

The key difference you've created is in the DataCardValue Default property.

In the default form: DataCardValue10.Default = Parent.Default
In your custom form: DataCardValue12.Default = Attachment_DataCard3.Default

These are not equivalent. Parent.Default inside a DataCard always refers to the DataCard's own Default property, which is where the form passes the record's attachment data. When you reference Attachment_DataCard3.Default directly by name, you're bypassing the form's data binding hierarchy and the attachment control doesn't receive the pre-loaded file data correctly.

Fix: change DataCardValue12's Default property back to:

Parent.Default

Don't reference the DataCard by name. The Parent keyword is the correct way to access the DataCard's Default from inside it.

Best regards,

Valantis

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