I have a Gallery1, that I have to input a signature and aprrove an item1. Then this item1 goes to a gallery2.
When I select item1 in gallery 2, I can view the previus signature.
Then I do the same with an item2. When I check both items in gallery2, I can view each signatures.
But if I close Powerapps and open it again, when select item1 or item2, at this time I can't view any signature.
Why in the first moment does PA show me the signature, and then never retrieves it from Sharepoint?
I've reviewed the issue in this forum "Problem with Add Image Control and appres//blobmanager", and Rebecca's solution (I think it will be fine for me). But I don't understand why at the beginning I can view the signature, and then it doesn't show anymore.
Could you please share a bit more about your issue?
Do you save the signature picture into your SP List? Which type column do you use to store the signature data (e.g. appres://blobmanager/d9e80e03539a47a69533e030bc24449a/14)?
Further, do you want to display the appres://blobmanager/d9e80e03539a47a69533e030bc24449a/14 signature data (image data reference) from your SP List into your app?
Based on the issue that you mentioned, I think this issue may be related to PowerApps app cache. When you open your app, and draw a signature within your Gallery1, the signature image data (e.g. appres://blobmanager/d9e80e03539a47a69533e030bc24449a/14) would be cached into your PowerApps app, so you could view it in anywhere of your app.
But when you close your app, the signature image data cache would be cleared. So when you re-open again, you would not be able to view the signature content using the appres://blobmanager/d9e80e03539a47a69533e030bc24449a/14 data.
As an alternative solution, please consider save your signature data as a image file in your SP Library, then within your SP List, add a Hyperlink type column to store the URL link to the saved signature file in your SP Library, after that, you could view the signature content from the Hyperlink column value from your SP List.
Please check and see if my response within the following thread would help in your scenario:
To save the URL link from SP Library to SP List, I've used Sharepoint-Create Sharing Link Flow. But when I run this flow, it gives the following error: Sharing by link is not enabled - The feature has been disabled.
How can I enable "Sharing by link" to copy the link from SP Library to SP List?