Find a community sample for TPaintBox with OnMouseMove events. Merge that into a new form.
However, moving from VCL to FMX—or starting FMX from scratch—comes with a steep learning curve. The layout system is different. The GPU-based rendering is different. Handling gestures, touches, and high-DPI screens requires a new mindset. delphi fmx samples
Study the FMX.REST.Client sample (part of RESTRequest4Delphi , a community library). It shows how to upload images to an S3 bucket via HTTP multipart form data. Find a community sample for TPaintBox with OnMouseMove
Introduction: Why Samples Matter in FireMonkey Delphi has long been a titan in the RAD (Rapid Application Development) world, but with the introduction of FireMonkey (FMX), Embarcadero transformed Delphi into a true cross-platform powerhouse. Unlike the Windows-only VCL (Visual Component Library), FMX allows developers to compile native applications for Windows, macOS, iOS, Android, and even Linux. The layout system is different