: If you want to add a "cover" image to the file so it displays a specific picture in your file explorer, tools like LosslessCut or FFmpeg can embed images as cover art without re-encoding the video.
: Services like iCloud or Google Photos may show a status icon (a "feature") covering the thumbnail while it uploads. IMG_1458.MP4
: If "covering" refers to masking a part of the video (like a watermark or a sensor artifact), most standard video editors like iMovie , CapCut , or Adobe Premiere can apply overlays or "masks" to hide specific areas. Troubleshooting : If you want to add a "cover"
