anonymous user Thanks for the question. Are you getting any error with Form Recognize Sample Labelling Tool when selecting an image from new azure blob storage container.
Custom Model: This mode can be trained to recognise specific form types based on your own example data set.
Please follow the below doc for connecting sample labelling tool with SAS URL.
https://learn.microsoft.com/en-us/azure/cognitive-services/form-recognizer/quickstarts/label-tool?tabs=v2-0#connect-to-the-sample-labeling-tool
Checkout the Knowledge Extraction Recipes resource: https://github.com/microsoft/knowledge-extraction-recipes-forms