I read all the related issues here which includes "filemanager invalid upload request".
The summed up proposals were:
I did all this but still i get the error "invalid upload request" when trying to upload pictures.
Dont know what do now. Can you help me please?

Edit: on my localhost development environment it works! but it doesnt work on my online server.
I changed my online system from Oneclick MySql Digitalocean droplet
to
forge/envoyer/digitalocean deployment system. Its the same code still but on my new system i dont have the issue anymore. So it is fine for now, since now somehow i skipped the problem, but still bugs me that i dont know how to fix it ;) Seemed to be a missing server config or something. (btw old one was apache2, new one is nginx)
i have same problem here, php-gd installed, php-imagick installed, exif is enabled, but file get error like this, in my local is fine

Same here. Ubuntu 16.04, PHP 7.2.3, GD enabled, Exif enabled. Haven't tried installing php-imagick yet, but will try that next.
Edit: Still not working, even with php-imagick installed. Dropzone seems to be the issue here...
Same here in Centos, but in Ubuntu for Windows works fine, I did the same in both...
i had the same problem. I solved the problem by giving 777 permission for 'photos' folder in public directory.
Got the same problem
I could get rid of the same issue with the @shoeseat solution for a development server but I want to ask for a real, more secure solution for a production server.
Thanks in advance, and besides of this, I really appreciate the great job done with this package 馃憤
This is fixed in v2.0.0-alph6. If "Invalid upload request" still occurs, please open a new issue or leave comments here and I will repoen this issue.
I still have that problem in version 2.0.0-alpha7 both locally and in production and with all the extensions that the plugin requires
I solved problem by giving 777 permission for uploads folder in public directory
I also face this problem. I think all shared hosting occur this problem. But no one gives a specific solution.
Most helpful comment
i had the same problem. I solved the problem by giving 777 permission for 'photos' folder in public directory.