Debug Flutter Image Picker Permission Differences on iOS and Android

A picker may not need broad library access

Modern platform pickers can let a user choose media without granting an app unrestricted access to the photo library. Whether that is true depends on the plugin version and platform API path. Adding every historical photo permission can create review questions and still fail to explain why one device behaves differently.

Record the OS version, plugin version, and exact action. Then inspect the plugin documentation and merged Android manifest or iOS Info.plist. On iOS, a permission usage description must accurately describe any protected resource the app actually requests. On Android, verify which manifest permissions survive the merge and whether the plugin uses the system Photo Picker.

Separate selection from later file access

The picker returning a path does not guarantee the file remains readable forever. Some platforms provide a temporary URI or scoped access. Read or copy the selected content while the grant is valid, handle cancellation as a normal result, and do not assume every selected image has a filesystem path with the same semantics.

Test a user cancel, a single selection, a large file, and a limited-library selection where supported. Verify behavior on at least one older supported OS and one current OS. If the result is denied, inspect the platform exception and permission state instead of prompting repeatedly.

Keep permission requests contextual and least-privileged. If a product truly needs ongoing library access, explain that need and implement the platform-specific permission flow. A one-time selection feature should not request broad access simply because an old plugin example included it.

Identify which picker flow the app is using

“Image picker” can describe two different designs. A system photo picker lets a person select specific media through an OS-owned interface and may return temporary access without granting the app broad library permission. A custom gallery browser may need broader access to enumerate media. Determine which flow the Flutter plugin and platform version actually use before adding declarations. A permission unnecessary for the system picker creates an avoidable denial path and asks for more access than the feature needs.

Check the plugin documentation and the native project files included in the built variant. On Android, inspect the merged manifest because plugins and flavors can contribute declarations. On iOS, verify the relevant usage-description keys in the final app bundle. A missing explanation can cause a platform failure; an overly broad declaration can trigger review questions. The final artifact, not one source file, is the authority.

Test the user journey across permission states

Use a clean install to test the initial flow and a separate run to test a prior denial. Verify what happens when the person cancels, selects one item, grants limited access, or changes access later in system settings. Cancellation is a normal outcome, not an exception. If access is permanently denied, show a clear explanation and a settings route only when the feature cannot work without that permission.

Test physical devices as well as simulators when the workflow depends on OS UI or hardware-backed media access. Platform versions can offer different selection and limited-library behavior. Record the OS version, plugin version, build flavor, and final permission state for a reproduction. This helps separate an application bug from a platform behavior change or a plugin-specific implementation detail.

Avoid solving a picker failure by requesting every photo, video, camera, and storage permission. Add only what the implemented flow requires, then inspect store declarations and privacy disclosures before release. If camera capture and library selection are separate features, test and explain their permissions separately. Least-privilege access improves user trust and platform review quality.

Include accessibility and recovery in the test matrix: keyboard or screen-reader users should be able to reach the picker action, understand a denial message, and return to the app after changing settings. A permission flow is not complete merely because the native dialog appears. Check the resulting user-visible state and confirm that repeated taps do not trigger a prompt loop or duplicate requests.

For large media, verify that the app handles temporary URI access and memory pressure without loading an entire original image into memory. Check cancellation, unsupported formats, and a user changing permission in settings between two launches. These cases often reveal a plugin assumption that was invisible on a modern simulator with a small fixture.