Sorry, this isn’t implemented yet but it’s still planned.
Image uploading is important us, but we have to decide how to best distribute our time and it’s not something we’re actively working on yet. Social media as a whole typically follows the 1% rule, which states that 99% of users on a typical online forum will lurk whilst only 1% create posts. It may well be slightly higher than 1% on Lemmy due to the culture here, but the fact remains that posting images is not something that the average Mlem user will do everyday. At the moment, we’re largely focusing on making improvements to the core Mlem experience that every user will benefit from on a daily basis.
Thanks for your patience!