Android devices and apps differ in HEIC support. A file may open in one gallery or editor but fail in another upload workflow.
What should you consider?
For sharing to a destination that expects JPG, make a compatibility copy and keep the original for your own archive.
Practical workflow
Start with the destination requirement, make a copy rather than overwriting an important original, and compare the output at the size where it will actually be used. If the file is still too large, consider whether resizing, compression or a different format solves the real problem.
Related tool
Tip: The smallest file is not automatically the best file. Compatibility and visible quality matter too.