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I couldnt upload any photos because every time I wanted to do it, I saw this message - Your post couldnt be uploaded to Instagram. Try logging out, then logging back in to your Instagram account. If this problem persists, do not hesitate in sending us a message through our support portal (tap the settings icon in the app). I wrote to the support but they didn’t respond.

Majkel55 about Uploader for Instagram - post pictures to Instagram, v1.0.0