Hi @MichaLoru ,
Do you want to upload photos from a collection to a SharePoint list? I've made a test for your reference:
1\Add a Add picture control(For testing purposes, I use picture control instead of Camera control)
2\Add a button.
OnSelect:
Collect(
MyPics, /*create a collection to save the pic*/
{
DisplayName: Concatenate(
"image",
Text(
Now(),
"[$-en-US]yyyy-mm-dd-hh-mm-ss"
),
".jpg"
),
Value: UploadedImage1.Image,
AbsoluteUri: "",
Id: "00000000-0000-0000-0000-000000000000"
}
)
4\Add a Form(Form1)
DefaultMode: FormMode.Edit
DataSource :'List A'
Item: LookUp('List A',ID=1) /* Specify records to update */
set the attachments control’s Items property to: MyPics(Important!Refer to the picture attachment for detailed settings)

Visible: false /* Make the entire form invisible (beautiful consideration)*/
4\Add a button
OnSelect:
SubmitForm(Form1);
Best Regards,
Bof