Lightroom Mobile (5.2.1): Issue sharing on instagram using Samsung S8 (Android v9)

Exporting photos from LR mobile to Instagram worked fine for years till now. The photo I select in LR mobile to share manages to open Instagram for a second or two, then it reverts back to LR mobile with an error message saying 'unable to load image'. I have uninstalled LR mobile and re-installed it but no improvement there. I have uninstalled Instagram and re-installed it as well. No improvement either. I have tried sharing photos that were already shared on Insta before, the problem still persists. I am out of options. 

Would appreciate any suggestions you may have. Thanks!