I've had that same problems with uploading photos this week too, so you have my sympathies, its annoying.
The shoes do look nice with the dress, but not that dressy IYSWIM, but that could depend on what the wedding would be like, if its low key, then yes go for it, but if not you need to dress up a bit more.
If it were me, I would go for bright contrasting accessories, so choose a colour you like & either have, or can find accessories in - bright red, bright deep orange, coral, shocking pink, bright purple IMO would work best, but you could also try bright yellow, bright turquoise or electric blue. If you are brave, you could also go for metallics which are in too.
I would find shoes, handbag, a large corsage or with metallics a brooch & depending on your style, maybe some sort of hair accessory in your chosen colour, or even if appropriate a summer hat, though that could be white with pin on corsage to match accessories
You will also need some sort of cover up for if the weather is cooler, or for the evening, so a smart jacket, cardigan or pashmina - you could go for the brights again, or you could go for white of the darker stripe colour - or again if you are brave you could choose a print that compliments the dress - graphic florals in the same colours as the dress for example - accessorise this with the corsage, & pin it on the dress when not wearing the cover up
HTH