If you need to upload images to the Console from your computer instead of a Walker, you can do that, but please be aware: this solution is not intended for bulk uploads. The web uploader can only handle 30 images at a time.
First go to the Event page...
Click Upload Image on the top right of the window
The uploading module will open with a subject search bar (so you can add subject IDs which will be associated with the image) and a space to drag and drop images / click on to open a file browser and locate the files you want to upload. There is also a bar which lets you decide what event the images will be sent to.
Once you've got the images and IDs you want, click Upload in the bottom right.
An upload progress bar will show on each thumbnail, and will change to a tick ✔️when each image is uploaded successfully. If the upload is unsuccessful, a cross ✖️will show. Check the details, and try again.
When the images have all finished uploading, the upload module will close, and a green banner will show at the bottom of the window indicating a successfully completed upload.