[NET10] MediaPicker multiselect

[davidortinau]

Description:

• Summary: Add .NET 10 guidance for multi-select media picking using PickPhotosAsync/PickVideosAsync (returning List) and document MediaPickerOptions (SelectionLimit, MaximumWidth/Height, CompressionQuality, RotateImage, PreserveMetaData, Title).
• Files changed:
  • docs/platform-integration/device-media/picker.md
• Monikers: Preserves <= .NET 9 content; adds >= .NET 10 section/examples for multi-select.
• Platform notes:
  • Android: The picker UI may not strictly enforce SelectionLimit.
  • Windows: SelectionLimit not supported; behavior may vary.
  • Cancelation returns an empty list.
• Verification: Cross-checked against MAUI net10.0 branch types and options.

---

Internal previews

📄 File	🔗 Preview link
docs/platform-integration/device-media/picker.md	docs/platform-integration/device-media/picker

[learn-build-service-prod]

Learn Build status updates of commit 00b5258:

✅ Validation status: passed

File	Status	Preview URL	Details
.github/copilot-instructions.md	✅Succeeded
docs/platform-integration/device-media/picker.md	✅Succeeded	View (>=net-maui-8.0)
docs/user-interface/includes/pop-ups-dotnet10.md	✅Succeeded	View (>=net-maui-8.0)

For more details, please refer to the build report.

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[Copilot]

Pull Request Overview

This pull request updates documentation for .NET MAUI 10's MediaPicker with multiselect support and improves async guidance for pop-ups. The changes use moniker ranges to provide version-specific documentation while maintaining backward compatibility.

• Adds comprehensive .NET 10 documentation for MediaPicker multiselect functionality with new APIs and examples
• Updates pop-ups documentation with async guidance for better UI responsiveness
• Includes detailed platform-specific notes and limitations for multiselect operations

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
docs/user-interface/includes/pop-ups-dotnet10.md	Adds guidance on using async methods from UI-thread contexts
docs/platform-integration/device-media/picker.md	Documents new .NET 10 multiselect MediaPicker APIs with examples and platform notes
.github/copilot-instructions.md	Adds comprehensive working instructions for .NET 10 documentation staging

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[learn-build-service-prod]

PoliCheck Scan Report

The following report lists PoliCheck issues in PR files. Before you merge the PR, you must fix all severity-1 issues. Other issues are also a high priority. The AI Review Details column lists suggestions for either removing or replacing the terms. If you find a false positive result, mention it in a PR comment and include this text: #policheck-false-positive. This feedback helps reduce false positives in future scans.

✅ No issues found

More information about PoliCheck

Information: PoliCheck | Severity Guidance | Term
For any questions: Try searching the learn.microsoft.com contributor guides or post your question in the Learn support channel.

[learn-build-service-prod]

Learn Build status updates of commit 638936e:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/platform-integration/device-media/picker.md	✅Succeeded	View (>=net-maui-8.0)

For more details, please refer to the build report.