I use Google Drive, is that an option for you? Easy for me to upload to that from my phone.
1. Upload the picture to Google Drive on my phone.
2. Go to Google Drive on my pc, move the picture to the "public" folder.
3. Right click the image and get "shareable link", which puts the url in your clipboard.
4. Then start your post here, click the image button and paste it in. BUT, within the link, change "open" to "uc".
5. Profit.