If you are trying to insert an image on sololearn, it wont work by giving a file path. What you have to do is go to imgbb.com and upload your desired image there. Choose HTML full linked while uploading. After img src, insert the url imgbb gave you. Now you're all set!
Happy coding ~ Hira
Use dropbox this will help you.
Remove ? dl=0 from last
Replace www with dl
Replace dropbox with dropboxusercontent
Now Final URL Is-
You are not providing the entire file path. That's why it's not working.
To load a local image, you need to specify the entire file path like: For a file in Internal Storage
file:///sdcard/..folderName../1234.png (for an android)
If you don't know how this works, you can get the file path by opening the file in Chrome browser, go to file:///sdcard and navigate to the desired file and now copy the path.
Here is a code example (but it only works in my phone because the file is not present in your phone.!! )